Physical Review Materials - February 2024

Physical Review Materials View Email Online   Volume 8, Issue 2 February 2024   View Issue   Advertisement Congratulations to the 2024 Outstanding Referees In this year, 2024, 156 Outstanding Referees were selected from the 91,600 currently active referees. The honorees come from over 42 different countries and will be recognized at the upcoming March Meeting. Read more.     Advertisement Physical Review Applied seeks a new Lead Editor The American Physical Society is conducting an international search for a new Lead Editor of Physical Review Applied, our premier journal for Applied Physics Research. The Lead Editor is the lead scientific advisor to the journal and chairs the Editorial Board. They provide community oversight of the journal's content and direction, strategically advising the journal's Chief Editor in a consultative capacity. The role is key in helping to shape the journal's long-term goals, and growing and elevating the journal within the community. 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Join today to start connecting with a community of more than 50,000 physicists.   HIGHLIGHTED ARTICLES Editors' Suggestion Quantum oscillations in kagome metals CsTi3Bi5 and RbTi3Bi5 Zackary Rehfuss, Christopher Broyles, David Graf, Yongkang Li, Hengxin Tan, Zhen Zhao, Jiali Liu, Yuhang Zhang, Xiaoli Dong, Haitao Yang, Hongjun Gao, Binghai Yan, and Sheng Ran Phys. Rev. Materials 8, 024003 (2024) – Published 14 February 2024 We explore quantum oscillations in the kagome metals CsTi3Bi5 and RbTi3Bi5, using high magnetic fields and low temperatures. We reveal new quantum oscillation frequencies in CsTi3Bi5, showing a complex Fermi surface that matches density functional theory predictions. Interestingly, the Rb compound exhibits notably different results from the Cs compound, despite theoretical expectations of similarity. This work deepens our understanding of the electronic intricacies within kagome lattice systems and spotlights their role as a playground for unearthing novel quantum states. Our findings pave the way for future investigations in the quantum behaviors of kagome metals, offering insights for advanced material development.     Editors' Suggestion Orbital degree of freedom in high entropy oxides Jiaqiang Yan, Abinash Kumar, Miaofang Chi, Matthew Brahlek, Thomas Z. Ward, and Michael A. McGuire Phys. Rev. Materials 8, 024404 (2024) – Published 7 February 2024 Understanding strongly correlated physics of electronic-driven orbital ordering in transition metal compounds has presented many long-standing questions. Utilizing high-entropy oxides have enabled understanding that disorder can unlock an unusual intermixing of orbital and spin in the rare-earth vanadate, RVO3, which shows that the average and variance of ionic radius determine and control unusual properties of the spin and orbital order. The ability to systematically control variance of the local structure in high-quality crystals which hold constant charge and spin is crucial for a deeper understanding and exploring unanswered decades-old question regarding the physics of the Kugel-Khomskii compounds.     Editors' Suggestion Giant interfacial in-plane magnetic anisotropy in Co/Pt bilayers grown on MgO(110) substrates Chao Zhou, Jia Xu, and Yizheng Wu Phys. Rev. Materials 8, 024408 (2024) – Published 21 February 2024 A material with strong in-plane magnetic anisotropy is crucial for determining the magnetization configuration of magnetic materials and their applications in high-density and high-frequency devices. Here, the authors successfully reported a giant interfacial uniaxial in-plane anisotropy in Co/Pt(110) bilayers, which is five times larger than that in Co/Pt(111), the most popular magnetic thin film with perpendicular magnetic anisotropy. Furthermore, such large interfacial magnetic anisotropy can be enhanced by forming a Pt/Co/Pt sandwich structure. These results enabled the integration of in-plane magnetic anisotropy systems into spintronic devices with increased speed and density.     Editors' Suggestion Tuning of spin-orbit coupling in chiral molecule-incorporated two-dimensional organic-inorganic hybrid perovskite copper halides with ferromagnetic exchange interactions Kouji Taniguchi, Po-Jung Huang, Hajime Sagayama, Ryoji Kiyanagi, Kazuki Ohishi, Shunsuke Kitou, Yuiga Nakamura, and Hitoshi Miyasaka Phys. Rev. Materials 8, 024409 (2024) – Published 23 February 2024 Simultaneous control of noncentrosymmetry and spin-orbit-coupling strength has been demonstrated in a series of chiral molecule-incorporated two-dimensional organic-inorganic hybrid perovskite copper halides (2D-OIHPs) with ferromagnetic exchange interaction. By substituting the halogen from Cl to Br, a systematic change of the magnetic phase diagram from the simple ferromagnetic phase to complicated multiple phases has been observed. This change is due to competition between the ferromagnetic exchange interaction and the Dzyaloshinskii-Moriya interaction. Materials design focusing on the structural flexibility of 2D-OIHP could pave the way to developing new types of nontrivial topological spin systems.     Editors' Suggestion Nanoscale dynamics of hydrogen in VO2 studied by μSR H. Okabe, M. Hiraishi, A. Koda, Y. Matsushita, T. Ohsawa, N. Ohashi, and R. Kadono Phys. Rev. Materials 8, 024602 (2024) – Published 13 February 2024 Vanadium dioxide (VO2) is a promising next-generation electronic material for artificial neural networks. Here, the authors use muon spin spectroscopy to provide a microscopic basis for understanding nanoscale hydrogen diffusion in VO2, using muons as a microscopic simulator of dilute hydrogen. This innovation allows the authors to investigate the dynamics of trace hydrogen in nanoscale regions such as thin films, which is very difficult to achieve with conventional methods. This study is expected not only to make a significant contribution to the development of VO2 devices but also to provide a unique method for observing the dynamics of hydrogen at the nanoscale.     Editors' Suggestion Scanning SQUID study of ferromagnetism and superconductivity in infinite-layer nickelates Ruby A. Shi, Bai Yang Wang, Yusuke Iguchi, Motoki Osada, Kyuho Lee, Berit H. Goodge, Lena F. Kourkoutis, Harold Y. Hwang, and Kathryn A. Moler Phys. Rev. Materials 8, 024802 (2024) – Published 21 February 2024 This work studied superconductivity and magnetism in infinite-layer nickelate films with scanning SQUID and cross-sectional STEM. The authors found a landscape of superparamagnetism from NiOx nanoparticles that are extrinsic to the superconductivity. They imaged superconducting vortices and determined the penetration depth. They measured the local diamagnetism, finding a consistent value of the penetration depth. The superfluid density exhibits nearly T-linear dependence, suggesting possible d-wave superconductivity. Using scanning SQUID to image the various sources of magnetism in superconducting nickelates paves the way for further studies of vortex dynamics and flux quantization in these recently discovered superconductors.     Editors' Suggestion Observation of van der Waals phonons in the single-layer cuprate (Bi,Pb)2(Sr,La)2CuO6+δ Y. Y. Peng, I. Boukahil, K. Krongchon, Q. Xiao, A. A. Husain, Sangjun Lee, Q. Z. Li, A. Alatas, A. H. Said, H. T. Yan, Y. Ding, L. Zhao, X. J. Zhou, T. P. Devereaux, L. K. Wagner, C. D. Pemmaraju, and P. Abbamonte Phys. Rev. Materials 8, 024804 (2024) – Published 26 February 2024 Interlayer van der Waals (vdW) coupling is ubiquitous in two-dimensional materials. The authors explore these interactions in the cuprate (Bi, Pb)2(Sr,La)2CuO6+δ, revealing ultra-low energy phonon modes similar to graphene and transition metal dichalcogenides. Using high-resolution inelastic hard x-ray scattering and first-principles simulations, they reveal vdW phonons from the shear motion of adjacent Bi-O layers. These findings deepen our understanding of the vibrational properties of cuprates and suggest opportunities for the design of novel heterostructures. These results highlight the generic nature of vdW modes in layered materials, including doped copper oxides, and provide insights for future materials design and research.     Editors' Suggestion Large-scale characterization of Cu2O monocrystals via Rydberg excitons Kerwan Morin, Delphine Lagarde, Angélique Gillet, Xavier Marie, and Thomas Boulier Phys. Rev. Materials 8, 026202 (2024) – Published 27 February 2024 This research introduces a novel experimental technique to characterize Rydberg excitons in copper oxide (Cu2O) crystals with sub-micron resolution. By employing spatially resolved resonant absorption spectroscopy and photoluminescence imaging, the study unveils the influence of optically-active charged oxygen vacancies on Rydberg excitons. This approach yields comprehensive spatial maps of exciton properties, including energy, linewidth, and peak absorption without any mobile part, providing valuable insights into crystal quality. The findings highlight the predominant role of charged oxygen vacancies in influencing Rydberg excitons in Cu2O and offer a reliable method for assessing crystal quality in view of solid-state Rydberg physics.     Editors' Suggestion Guiding diamond spin qubit growth with computational methods Jonathan C. Marcks, Mykyta Onizhuk, Nazar Delegan, Yu-Xin Wang (王语馨), Masaya Fukami, Maya Watts, Aashish A. Clerk, F. Joseph Heremans, Giulia Galli, and David D. Awschalom Phys. Rev. Materials 8, 026204 (2024) – Published 28 February 2024 Spin defects in semiconductors play a major role in quantum technologies. Synthesizing high-quality spin qubits relies on controlling the incorporation of noise sources, such as other, unwanted spin defects, into the host crystal. In this work, the authors provide quantitative calculations of the coherence properties of spin qubits in diamond. They incorporate these results into an existing materials synthesis platform to develop predictive models and in situ feedback for more reliable creation of qubits tailored to applications.     Editors' Suggestion Letter Lateral solid phase epitaxy of yttrium iron garnet Sebastian Sailler, Darius Pohl, Heike Schlörb, Bernd Rellinghaus, Andy Thomas, Sebastian T. B. Goennenwein, and Michaela Lammel Phys. Rev. Materials 8, L020402 (2024) – Published 29 February 2024 Yttrium iron garnet (YIG) is a prototypical material in the fields of spintronics and magnonics due to its exceptional magnetic properties. However, up to now, the focus has been on planar YIG thin films owing to the challenges associated with manufacturing non-planar structures. Here, the authors demonstrate the fabrication of single crystalline YIG via lateral solid phase epitaxy on top of an artificially defined SiOx mesa over micrometer length scales. The reported results lay the foundation for the development of non-planar, epitaxial YIG thin films as well as free standing YIG structures, while still maintaining complete control over the crystal orientation.     Editors' Suggestion Letter Topological diffusive metal in amorphous transition metal monosilicides Selma Franca and Adolfo G. Grushin Phys. Rev. Materials 8, L021201 (2024) – Published 14 February 2024 Transition metal monosilicides RhSi and CoSi have intriguing physical properties such as long Fermi arc surface states and unusual optical responses. These features originate from multifold fermions - higher spin generalizations of Weyl quasiparticles that are protected by crystalline symmetries. Since these materials are prone to intrinsic disorder, the authors theoretically study topological properties of amorphous RhSi and CoSi. Using the spectral localizer, they find that multifold fermions survive disorder strengths that convert the semimetal into a diffusive metal phase. These conclusions are supported by photoemission simulations showing the presence of Fermi arcs in the corresponding disorder range.     Editors' Suggestion Letter Electronic structure of nitrogen-doped lutetium hydrides Adam Denchfield, Hyowon Park, and Russell J. Hemley Phys. Rev. Materials 8, L021801 (2024) – Published 16 February 2024 Hydrides at high pressures constitute the only materials to be superconducting above 200 K, and are typically marked by an appreciable hydrogen density of states and van Hove singularities at the Fermi energy. Given the recent interest in nitrogen-doped lutetium hydride, the authors focused on finding the structures which would have electronic properties that could plausibly support high-temperature superconductivity within a narrow pressure range. They have identified a narrow range of stoichiometries Lu8H23−xN with hydrogen-dominant conduction states, and found one structure which exhibits a very large hydrogen density of states with an extremely sharp van Hove singularity, whose properties may therefore change dramatically under pressure.     REVIEW ARTICLES Relationship between molecular structure and corrugations in self-assembled polypeptoid nanosheets revealed by cryogenic electron microscopy Xi Jiang, Ronald N. Zuckermann, and Nitash P. Balsara Phys. Rev. Materials 8, 020301 (2024) – Published 13 February 2024 Designing conformationally dynamic molecules that self-assemble into predictable nanostructures remains a significant unmet challenge. This work describes the application of atomic-scale cryogenic transmission electron microscopy (cryo-TEM) to elucidate the relationship between molecular structure and self-assembly of block copolymers. Cryo-TEM images revealed the presence of atomic-scale corrugations in sheet-like micelles that are not anticipated by theories which assume that the surfaces of micelles are smooth. The authors propose that the atomic-scale corrugations are due to the dipolar nature of the monomers and interactions between the monomers and water molecules.     Exploration of complex nanostructures in block copolymers Hojun Lee, Jihoon Kim, and Moon Jeong Park Phys. Rev. Materials 8, 020302 (2024) – Published 13 February 2024 Unlocking complex nanostructures like triply periodic minimal surfaces in block copolymer systems poses a crucial hurdle in creating multiscale functional materials. Despite ingenious methods such as interface manipulation, introduction of conformational asymmetry, and chain connectivity regulation, achieving block copolymer self-assembly into nanostructures with high packing frustration remains elusive. In this research update, the authors spotlight the use of end-group chemistry as an effective strategy for stabilizing diverse complex network morphologies beyond the gyroid. Particularly, they redefine phase diagrams by introducing robust end-to-end interactions through end-group and linker chemistry, unveiling unprecedented network structures.     LETTERS Crystal growth, crystallization, and kinetics Letter Onset of uncontrolled polytypism during the Au-catalyzed growth of wurtzite GaAs nanowires Wouter H. J. Peeters, Marco Vettori, Elham M. T. Fadaly, Alexandre Danescu, Chenyang Mao, Marcel A. Verheijen, and Erik P. A. M. Bakkers Phys. Rev. Materials 8, L020401 (2024) – Published 27 February 2024   Editors' Suggestion Letter Lateral solid phase epitaxy of yttrium iron garnet Sebastian Sailler, Darius Pohl, Heike Schlörb, Bernd Rellinghaus, Andy Thomas, Sebastian T. B. Goennenwein, and Michaela Lammel Phys. Rev. Materials 8, L020402 (2024) – Published 29 February 2024 Yttrium iron garnet (YIG) is a prototypical material in the fields of spintronics and magnonics due to its exceptional magnetic properties. However, up to now, the focus has been on planar YIG thin films owing to the challenges associated with manufacturing non-planar structures. Here, the authors demonstrate the fabrication of single crystalline YIG via lateral solid phase epitaxy on top of an artificially defined SiOx mesa over micrometer length scales. The reported results lay the foundation for the development of non-planar, epitaxial YIG thin films as well as free standing YIG structures, while still maintaining complete control over the crystal orientation.     Topological and Dirac materials Editors' Suggestion Letter Topological diffusive metal in amorphous transition metal monosilicides Selma Franca and Adolfo G. Grushin Phys. Rev. Materials 8, L021201 (2024) – Published 14 February 2024 Transition metal monosilicides RhSi and CoSi have intriguing physical properties such as long Fermi arc surface states and unusual optical responses. These features originate from multifold fermions - higher spin generalizations of Weyl quasiparticles that are protected by crystalline symmetries. Since these materials are prone to intrinsic disorder, the authors theoretically study topological properties of amorphous RhSi and CoSi. Using the spectral localizer, they find that multifold fermions survive disorder strengths that convert the semimetal into a diffusive metal phase. These conclusions are supported by photoemission simulations showing the presence of Fermi arcs in the corresponding disorder range.     Superconducting materials Editors' Suggestion Letter Electronic structure of nitrogen-doped lutetium hydrides Adam Denchfield, Hyowon Park, and Russell J. Hemley Phys. Rev. Materials 8, L021801 (2024) – Published 16 February 2024 Hydrides at high pressures constitute the only materials to be superconducting above 200 K, and are typically marked by an appreciable hydrogen density of states and van Hove singularities at the Fermi energy. Given the recent interest in nitrogen-doped lutetium hydride, the authors focused on finding the structures which would have electronic properties that could plausibly support high-temperature superconductivity within a narrow pressure range. They have identified a narrow range of stoichiometries Lu8H23−xN with hydrogen-dominant conduction states, and found one structure which exhibits a very large hydrogen density of states with an extremely sharp van Hove singularity, whose properties may therefore change dramatically under pressure.     ARTICLES Crystal growth, crystallization, and kinetics Single crystal growth of FeRh from AuPb flux Nikola Subotić, Miwako Takahashi, Takashi Mochiku, Yoshitaka Matsushita, Takanari Kashiwagi, Osamu Takeuchi, Hidemi Shigekawa, and Kazuo Kadowaki Phys. Rev. Materials 8, 023401 (2024) – Published 13 February 2024   Structural and mechanical properties Thermoelectric properties of SnSe and SnSe2 single crystals Abhinna Rajbanshi, Daniel Duong, Eklavya Thareja, Williams A. Shelton, and Rongying Jin Phys. Rev. Materials 8, 023601 (2024) – Published 20 February 2024   Effects of vacancy transport and surface adsorption on grain boundary migration in pure metals Alexander F. Chadwick and Peter W. Voorhees Phys. Rev. Materials 8, 023602 (2024) – Published 27 February 2024   Development of new methods for materials Thermal expansion and temperature dependence of Raman modes in epitaxial layers of Ge and Ge1−xSnx Agnieszka Anna Corley-Wiciak, Diana Ryzhak, Marvin Hartwig Zoellner, Costanza Lucia Manganelli, Omar Concepción, Oliver Skibitzki, Detlev Grützmacher, Dan Buca, Giovanni Capellini, and Davide Spirito Phys. Rev. Materials 8, 023801 (2024) – Published 1 February 2024   Two-dimensional materials Quasiparticle and excitonic properties of monolayer SrTiO3 Lorenzo Varrassi, Peitao Liu, and Cesare Franchini Phys. Rev. Materials 8, 024001 (2024) – Published 7 February 2024   Thermal and magnetoelastic properties of the van der Waals ferromagnet Fe3−δGeTe2: Anisotropic spontaneous magnetostriction and ferromagnetic magnon excitations Reinhard K. Kremer and Eva Brücher Phys. Rev. Materials 8, 024002 (2024) – Published 9 February 2024   Editors' Suggestion Quantum oscillations in kagome metals CsTi3Bi5 and RbTi3Bi5 Zackary Rehfuss, Christopher Broyles, David Graf, Yongkang Li, Hengxin Tan, Zhen Zhao, Jiali Liu, Yuhang Zhang, Xiaoli Dong, Haitao Yang, Hongjun Gao, Binghai Yan, and Sheng Ran Phys. Rev. Materials 8, 024003 (2024) – Published 14 February 2024 We explore quantum oscillations in the kagome metals CsTi3Bi5 and RbTi3Bi5, using high magnetic fields and low temperatures. We reveal new quantum oscillation frequencies in CsTi3Bi5, showing a complex Fermi surface that matches density functional theory predictions. Interestingly, the Rb compound exhibits notably different results from the Cs compound, despite theoretical expectations of similarity. This work deepens our understanding of the electronic intricacies within kagome lattice systems and spotlights their role as a playground for unearthing novel quantum states. Our findings pave the way for future investigations in the quantum behaviors of kagome metals, offering insights for advanced material development.     Competition of disorder and electron-phonon coupling in 2H−TaSe2−xSx (0≤x≤2) as evidenced by Raman spectroscopy J. Blagojević, S. Djurdjić Mijin, J. Bekaert, M. Opačić, Y. Liu, M. V. Milošević, C. Petrović, Z. V. Popović, and N. Lazarević Phys. Rev. Materials 8, 024004 (2024) – Published 21 February 2024   Robust Zeeman-type band splitting in sliding ferroelectrics Homayoun Jafari, Evgenii Barts, Przemysław Przybysz, Karma Tenzin, Paweł J. Kowalczyk, Paweł Dabrowski, and Jagoda Sławińska Phys. Rev. Materials 8, 024005 (2024) – Published 28 February 2024   Topological and Dirac materials High-throughput screening of Weyl semimetals Davide Grassano, Nicola Marzari, and Davide Campi Phys. Rev. Materials 8, 024201 (2024) – Published 9 February 2024   Magnetic, ferroelectric, and multiferroic materials Multiferroism in strained strontium hexaferrite epitaxial thin films Joonhyuk Lee, Sam Yeon Cho, Inhwan Kim, Christopher M. Rouleau, Kungwan Kang, Sangkyun Ryu, Yunseok Heo, Jong K. Keum, Daniel M. Pajerowski, Younghak Kim, Sang Don Bu, Jaekwang Lee, and Hyoungjeen Jeen Phys. Rev. Materials 8, 024401 (2024) – Published 5 February 2024   High-pressure effects on structural, magnetic, and vibrational properties of van der Waals antiferromagnet MnPS3 D. P. Kozlenko, O. N. Lis, N. T. Dang, M. Coak, J.-G. Park, E. V. Lukin, S. E. Kichanov, N. O. Golosova, I. Yu. Zel, and B. N. Savenko Phys. Rev. Materials 8, 024402 (2024) – Published 6 February 2024   Microscopic insights on field induced switching and domain wall motion in orthorhombic ferroelectrics Ruben Khachaturyan, Yijing Yang, Sheng-Han Teng, Benjamin Udofia, Markus Stricker, and Anna Grünebohm Phys. Rev. Materials 8, 024403 (2024) – Published 7 February 2024   Editors' Suggestion Orbital degree of freedom in high entropy oxides Jiaqiang Yan, Abinash Kumar, Miaofang Chi, Matthew Brahlek, Thomas Z. Ward, and Michael A. McGuire Phys. Rev. Materials 8, 024404 (2024) – Published 7 February 2024 Understanding strongly correlated physics of electronic-driven orbital ordering in transition metal compounds has presented many long-standing questions. Utilizing high-entropy oxides have enabled understanding that disorder can unlock an unusual intermixing of orbital and spin in the rare-earth vanadate, RVO3, which shows that the average and variance of ionic radius determine and control unusual properties of the spin and orbital order. The ability to systematically control variance of the local structure in high-quality crystals which hold constant charge and spin is crucial for a deeper understanding and exploring unanswered decades-old question regarding the physics of the Kugel-Khomskii compounds.     Successive magnetic phase transitions with magnetoelastic and magnetodielectric coupling in the ordered triple perovskite Sr3CaRu2O9 Arun Kumar, Pascal Manuel, and Sunil Nair Phys. Rev. Materials 8, 024405 (2024) – Published 13 February 2024   Mastering disorder in a first-order transition by ion irradiation S. Cervera, M. LoBue, E. Fontana, M. Eddrief, V. H. Etgens, E. Lamour, S. Macé, M. Marangolo, E. Plouet, C. Prigent, S. Steydli, D. Vernhet, and M. Trassinelli Phys. Rev. Materials 8, 024406 (2024) – Published 13 February 2024   Insights into ε−Fe2O3 interactions via Cr doping Rachel Nickel, Chengjun Sun, Debora Motta Meira, Padraic Shafer, and Johan van Lierop Phys. Rev. Materials 8, 024407 (2024) – Published 16 February 2024   Editors' Suggestion Giant interfacial in-plane magnetic anisotropy in Co/Pt bilayers grown on MgO(110) substrates Chao Zhou, Jia Xu, and Yizheng Wu Phys. Rev. Materials 8, 024408 (2024) – Published 21 February 2024 A material with strong in-plane magnetic anisotropy is crucial for determining the magnetization configuration of magnetic materials and their applications in high-density and high-frequency devices. Here, the authors successfully reported a giant interfacial uniaxial in-plane anisotropy in Co/Pt(110) bilayers, which is five times larger than that in Co/Pt(111), the most popular magnetic thin film with perpendicular magnetic anisotropy. Furthermore, such large interfacial magnetic anisotropy can be enhanced by forming a Pt/Co/Pt sandwich structure. These results enabled the integration of in-plane magnetic anisotropy systems into spintronic devices with increased speed and density.     Editors' Suggestion Tuning of spin-orbit coupling in chiral molecule-incorporated two-dimensional organic-inorganic hybrid perovskite copper halides with ferromagnetic exchange interactions Kouji Taniguchi, Po-Jung Huang, Hajime Sagayama, Ryoji Kiyanagi, Kazuki Ohishi, Shunsuke Kitou, Yuiga Nakamura, and Hitoshi Miyasaka Phys. Rev. Materials 8, 024409 (2024) – Published 23 February 2024 Simultaneous control of noncentrosymmetry and spin-orbit-coupling strength has been demonstrated in a series of chiral molecule-incorporated two-dimensional organic-inorganic hybrid perovskite copper halides (2D-OIHPs) with ferromagnetic exchange interaction. By substituting the halogen from Cl to Br, a systematic change of the magnetic phase diagram from the simple ferromagnetic phase to complicated multiple phases has been observed. This change is due to competition between the ferromagnetic exchange interaction and the Dzyaloshinskii-Moriya interaction. Materials design focusing on the structural flexibility of 2D-OIHP could pave the way to developing new types of nontrivial topological spin systems.     Emergence of half-metallic ferromagnetism in transition metal substituted Na0.5Bi0.5TiO3 Chandan Kumar Vishwakarma and B. K. Mani Phys. Rev. Materials 8, 024410 (2024) – Published 26 February 2024   Ca3Ru2O7: Interplay among degrees of freedom and the role of the exchange correlation A. M León, J. W. González, and H. Rosner Phys. Rev. Materials 8, 024411 (2024) – Published 27 February 2024   Semiconducting materials Investigation of the structure-transport correlation in metal phthalocyanine thin films Sabyasachi Karmakar, Mrinmay K. Mukhopadhyay, and Milan K. Sanyal Phys. Rev. Materials 8, 024601 (2024) – Published 8 February 2024   Editors' Suggestion Nanoscale dynamics of hydrogen in VO2 studied by μSR H. Okabe, M. Hiraishi, A. Koda, Y. Matsushita, T. Ohsawa, N. Ohashi, and R. Kadono Phys. Rev. Materials 8, 024602 (2024) – Published 13 February 2024 Vanadium dioxide (VO2) is a promising next-generation electronic material for artificial neural networks. Here, the authors use muon spin spectroscopy to provide a microscopic basis for understanding nanoscale hydrogen diffusion in VO2, using muons as a microscopic simulator of dilute hydrogen. This innovation allows the authors to investigate the dynamics of trace hydrogen in nanoscale regions such as thin films, which is very difficult to achieve with conventional methods. This study is expected not only to make a significant contribution to the development of VO2 devices but also to provide a unique method for observing the dynamics of hydrogen at the nanoscale.     X-ray absorption spectroscopy of oligothiophene crystals from many-body perturbation theory Konstantin Lion, Caterina Cocchi, and Claudia Draxl Phys. Rev. Materials 8, 024603 (2024) – Published 27 February 2024   Superconducting materials Superconductivity in compositionally complex cuprates with the YBa2Cu3O7−x structure Aditya Raghavan, Nathan D. Arndt, Nayelie Morales-Colón, Eli Wennen, Megan Wolfe, Carolina Oliveira Gandin, Kade Nelson, Robert Nowak, Sam Dillon, Keon Sahebkar, and Ryan F. Need Phys. Rev. Materials 8, 024801 (2024) – Published 20 February 2024   Editors' Suggestion Scanning SQUID study of ferromagnetism and superconductivity in infinite-layer nickelates Ruby A. Shi, Bai Yang Wang, Yusuke Iguchi, Motoki Osada, Kyuho Lee, Berit H. Goodge, Lena F. Kourkoutis, Harold Y. Hwang, and Kathryn A. Moler Phys. Rev. Materials 8, 024802 (2024) – Published 21 February 2024 This work studied superconductivity and magnetism in infinite-layer nickelate films with scanning SQUID and cross-sectional STEM. The authors found a landscape of superparamagnetism from NiOx nanoparticles that are extrinsic to the superconductivity. They imaged superconducting vortices and determined the penetration depth. They measured the local diamagnetism, finding a consistent value of the penetration depth. The superfluid density exhibits nearly T-linear dependence, suggesting possible d-wave superconductivity. Using scanning SQUID to image the various sources of magnetism in superconducting nickelates paves the way for further studies of vortex dynamics and flux quantization in these recently discovered superconductors.     Heteroanionic stabilization of Ni1+ with nonplanar coordination in layered nickelates Jaye K. Harada, Nenian Charles, Nathan Z. Koocher, Yiran Wang, Kendall R. Kamp, Makayla R. Baxter, Kenneth R. Poeppelmeier, Danilo Puggioni, and James M. Rondinelli Phys. Rev. Materials 8, 024803 (2024) – Published 22 February 2024   Editors' Suggestion Observation of van der Waals phonons in the single-layer cuprate (Bi,Pb)2(Sr,La)2CuO6+δ Y. Y. Peng, I. Boukahil, K. Krongchon, Q. Xiao, A. A. Husain, Sangjun Lee, Q. Z. Li, A. Alatas, A. H. Said, H. T. Yan, Y. Ding, L. Zhao, X. J. Zhou, T. P. Devereaux, L. K. Wagner, C. D. Pemmaraju, and P. Abbamonte Phys. Rev. Materials 8, 024804 (2024) – Published 26 February 2024 Interlayer van der Waals (vdW) coupling is ubiquitous in two-dimensional materials. The authors explore these interactions in the cuprate (Bi, Pb)2(Sr,La)2CuO6+δ, revealing ultra-low energy phonon modes similar to graphene and transition metal dichalcogenides. Using high-resolution inelastic hard x-ray scattering and first-principles simulations, they reveal vdW phonons from the shear motion of adjacent Bi-O layers. These findings deepen our understanding of the vibrational properties of cuprates and suggest opportunities for the design of novel heterostructures. These results highlight the generic nature of vdW modes in layered materials, including doped copper oxides, and provide insights for future materials design and research.     Other electronic materials Correlation between electronic polarization and shift current in cubic and hexagonal semiconductors LiZnX (X=P, As, Sb) Urmimala Dey, Jeroen van den Brink, and Rajyavardhan Ray Phys. Rev. Materials 8, 025001 (2024) – Published 15 February 2024   Metamaterials, optical, photonic, and plasmonic materials Thermalization of electron-hole pairs in LaBr3, CeBr3 and CLLB: Monte Carlo simulation Fei Gao, Zhe Shi, Ju Li, and Jarek Glodo Phys. Rev. Materials 8, 025201 (2024) – Published 5 February 2024   Linear electro-optic effect in trigonal LiNbO3: A first-principles study Inhwan Kim and Alexander A. Demkov Phys. Rev. Materials 8, 025202 (2024) – Published 28 February 2024   Materials for energy harvesting, storage, and generation First-principles determination of the phonon-point defect scattering and thermal transport due to fission products in ThO2 Linu Malakkal, Ankita Katre, Shuxiang Zhou, Chao Jiang, David H. Hurley, Chris A. Marianetti, and Marat Khafizov Phys. Rev. Materials 8, 025401 (2024) – Published 8 February 2024   Atomistic simulations of nuclear fuel UO2 with machine learning interatomic potentials Eliott T. Dubois, Julien Tranchida, Johann Bouchet, and Jean-Bernard Maillet Phys. Rev. Materials 8, 025402 (2024) – Published 14 February 2024   Structural, optical, and electronic properties of single crystals of 4H lead-based hexagonal hybrid perovskite Florent Pawula, Ali Fakih, Stanislav Péchev, Ramzy Daou, Daniele Mantione, Oleg Lebedev, Antoine Maignan, Georges Hadziioannou, Sylvie Hébert, and Guillaume Fleury Phys. Rev. Materials 8, 025403 (2024) – Published 28 February 2024   Soft, molecular, and amorphous materials Useful strategy for assuming complex ordered phases possibly formed by ABC-type block copolymers Qingshu Dong, Luyang Li, Zhanwen Xu, and Weihua Li Phys. Rev. Materials 8, 025601 (2024) – Published 2 February 2024 ABC-type block copolymers can self-assemble into a great variety of complex ordered structures due to their large parameter space as well as highly designable architectures. However, due to their complexity, the potential of ABC-type block copolymers is far from being fully explored. A starting point in unlocking the potential of ABC-type block copolymers is to speculate on what structures they can form. In this work, the authors propose a useful rule to systematically assume ordered structures possibly formed by ABC-type block copolymers. Through this strategy, they construct a series of ABCtype structures. Some of these fascinating novel structures are expected to have special properties, which may be obtained by properly designing the architecture of ABC-type block copolymers. Finally, the authors verify the effectiveness of this strategy by SCFT calculations.     Classifying the age of a glass based on structural properties: A machine learning approach Giulia Janzen, Casper Smit, Samantha Visbeek, Vincent E. Debets, Chengjie Luo, Cornelis Storm, Simone Ciarella, and Liesbeth M. C. Janssen Phys. Rev. Materials 8, 025602 (2024) – Published 21 February 2024   Nanomaterials Electrified fracture of nanotube films Jinbo Bian, Shijun Wang, Zhaokuan Yu, Zhong Zhang, and Zhiping Xu Phys. Rev. Materials 8, 026001 (2024) – Published 15 February 2024   Materials for Quantum Technologies Current-induced magnetization switching in a magnetic topological insulator heterostructure Erik Zimmermann, Justus Teller, Michael Schleenvoigt, Gerrit Behner, Peter Schüffelgen, Hans Lüth, Detlev Grützmacher, and Thomas Schäpers Phys. Rev. Materials 8, 026201 (2024) – Published 20 February 2024   Editors' Suggestion Large-scale characterization of Cu2O monocrystals via Rydberg excitons Kerwan Morin, Delphine Lagarde, Angélique Gillet, Xavier Marie, and Thomas Boulier Phys. Rev. Materials 8, 026202 (2024) – Published 27 February 2024 This research introduces a novel experimental technique to characterize Rydberg excitons in copper oxide (Cu2O) crystals with sub-micron resolution. By employing spatially resolved resonant absorption spectroscopy and photoluminescence imaging, the study unveils the influence of optically-active charged oxygen vacancies on Rydberg excitons. This approach yields comprehensive spatial maps of exciton properties, including energy, linewidth, and peak absorption without any mobile part, providing valuable insights into crystal quality. The findings highlight the predominant role of charged oxygen vacancies in influencing Rydberg excitons in Cu2O and offer a reliable method for assessing crystal quality in view of solid-state Rydberg physics.     Detecting nitrogen-vacancy-hydrogen centers on the nanoscale using nitrogen-vacancy centers in diamond Christoph Findler, Rémi Blinder, Karolina Schüle, Priyadharshini Balasubramanian, Christian Osterkamp, and Fedor Jelezko Phys. Rev. Materials 8, 026203 (2024) – Published 28 February 2024   Editors' Suggestion Guiding diamond spin qubit growth with computational methods Jonathan C. Marcks, Mykyta Onizhuk, Nazar Delegan, Yu-Xin Wang (王语馨), Masaya Fukami, Maya Watts, Aashish A. Clerk, F. Joseph Heremans, Giulia Galli, and David D. Awschalom Phys. Rev. Materials 8, 026204 (2024) – Published 28 February 2024 Spin defects in semiconductors play a major role in quantum technologies. Synthesizing high-quality spin qubits relies on controlling the incorporation of noise sources, such as other, unwanted spin defects, into the host crystal. In this work, the authors provide quantitative calculations of the coherence properties of spin qubits in diamond. They incorporate these results into an existing materials synthesis platform to develop predictive models and in situ feedback for more reliable creation of qubits tailored to applications.       American Physical Society: 1 Physics Ellipse, College Park, MD 20740 ©2024 American Physical Society | All rights reserved   You are receiving this email because you are subscribed to Table of Content alerts. If you no longer wish to receive these emails, please update your preferences.