Article
Physics, Multidisciplinary
Tianqi Wan, Yang Sun, Renata M. Wentzcovitch
Summary: In this study, the structure and magnetic ground state of ferropericlase (fp) were investigated using ab initio methods. It was found that fp undergoes a rare form of pressure/strain-induced magnetism and a B1-to-B2 phase transition, similar to FeO and MgO. The phase diagram was obtained considering vibrational effects and electronic and magnetic entropy contributions. These findings have important implications for understanding the structure and dynamics of the mantles of super-Earths.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Chemistry, Inorganic & Nuclear
Harry W. T. Morgan, Takafumi Yamamoto, Takumi Nishikubo, Takuya Ohmi, Takehiro Koike, Yuki Sakai, Masaki Azuma, Hirofumi Ishii, Genki Kobayashi, John E. McGrady
Summary: This study presents a detailed investigation into the influence of pressure on the mixed-anion oxyhydride phase Ba2YHO3, which exhibits hydride conductivity. It is found that pressure induces two sequential structural transitions in the interlayer regions. Experimental observation and theoretical calculations provide insights into the structural impact of pressure.
INORGANIC CHEMISTRY
(2022)
Article
Materials Science, Multidisciplinary
F. Della Pia, D. Alfe
Summary: The study shows that the presence of iron atoms increases the transition pressure and extends the stability of the B1 crystalline structure of MgxFe1-xO ferropericlase, with a significant nonhomogeneous distribution of iron atoms between the two phases at low temperatures.
Article
Physics, Multidisciplinary
Y. Y. Zhang, Y. X. Li, D. Fan, N. B. Zhang, J. W. Huang, M. X. Tang, Y. Cai, X. L. Zeng, T. Sun, K. Fezzaa, S. Chen, S. N. Luo
Summary: The study used subnanosecond synchrotron x-ray diffraction to visualize the lattice response of single-crystal KCl to planar shock compression, revealing the complete B1-B2 orientation relations and transition mechanisms. The findings showed that these orientation relations and transition mechanisms are anisotropic, and can be described with different models, establishing a paradigm for investigating solid-solid phase transitions under dynamic extremes.
PHYSICAL REVIEW LETTERS
(2021)
Article
Multidisciplinary Sciences
Wen-Pin Hsieh
Summary: The study on the thermal conductivity and compressional velocity of sodium chloride at high pressure conditions provides valuable insights into its physical properties. Additionally, the linear relationship between density and compressional velocity further supports the applicability of Birch's law to sodium chloride within the density range studied.
SCIENTIFIC REPORTS
(2021)
Article
Physics, Multidisciplinary
Archak Purkayastha, Madhumita Saha, Bijay Kumar Agarwalla
Summary: This study reveals that a one-dimensional ordered fermionic lattice system connected to two baths with different chemical potentials at zero temperature exhibits two phases of subdiffusive conductance scaling with system size, unlike the perfectly ballistic transport in the isolated system. Interestingly, there are two chemical-potential-driven subdiffusive to ballistic phase transitions at zero temperature in the open system scenario.
PHYSICAL REVIEW LETTERS
(2021)
Article
Microbiology
Yeongjin Yun, Sangjun Han, Yoon Sik Park, Hyunjae Park, Dogyeong Kim, Yeseul Kim, Yongdae Kwon, Sumin Kim, Jung Hun Lee, Jeong Ho Jeon, Sang Hee Lee, Lin-Woo Kang
Summary: Metallo-beta-lactamases (MBLs) plays a crucial role in the hydrolysis of antibiotics. However, effective clinical inhibitors for MBLs are currently unavailable. This study systematically investigated the primary sequences and crystal structures of MBLs, focusing on the conserved scaffold, zinc-coordinating residues, and substrate-binding pocket. The comparison among MBL subclasses revealed structural differences and highlighted the importance of the substrate-binding pocket in substrate specificity and drug resistance. The findings provide valuable insights for the development of clinical inhibitors targeting MBLs.
FRONTIERS IN MICROBIOLOGY
(2022)
Article
Multidisciplinary Sciences
F. H. Yu, D. H. Ma, W. Z. Zhuo, S. Q. Liu, X. K. Wen, B. Lei, J. J. Ying, X. H. Chen
Summary: The competition between superconductivity and CDW state in the pressurized kagome lattice of CsV3Sb5 displays complex effects, with unexpected double-peak behavior observed under high pressure conditions.
NATURE COMMUNICATIONS
(2021)
Article
Physics, Multidisciplinary
Hailong Li, Chui-Zhen Chen, Hua Jiang, X. C. Xie
Summary: Researchers proposed a physical picture based on Anderson localization to explain the observed Hall plateaus in MnBi2Te4, confirming localized bulk states in the absence of a magnetic field and observing a C = 2 phase under a strong magnetic field. Future experiments will verify more coexistence states of QAH and QH.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
H. C. Kao, Dingping Li, Baruch Rosenstein
Summary: This study shows that a one band Hubbard model with intermediate coupling can explain the two most important unusual properties of a normal state: linear resistivity strange metal and the pseudogap. By employing a relatively simple post-Gaussian approximation, both the spectroscopic and transport properties of the cuprates are considered at relevant temperatures. The research provides an alternative paradigm on the strength of the coupling required to describe the strange metal.
Article
Spectroscopy
Edgar Mosquera-Vargas, Carlos Marin
Summary: The structural changes of n-alkanes during melting and freezing processes were investigated using Raman spectroscopy. Different n-alkanes undergo different phase transitions, including the rotator phase and the alpha phase. During freezing, even n-alkanes form the rotator phase before the crystalline solid phase.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2022)
Article
Materials Science, Multidisciplinary
Rong-Yang Sun, Zheng Zhu
Summary: The study reveals a metal-insulator transition in the half-filled Kagome lattice Hubbard model, with different phases identified as U/t ratio increases, including a metallic phase, a translational symmetry breaking phase, and a quantum spin liquid phase. The findings suggest insights into exotic Kagome lattice materials.
Article
Plant Sciences
Yongran Ji, Jarno Mooren, Leo F. M. Marcelis, Ep Heuvelink
Summary: Plants have photoreceptors, such as phytochromes, to perceive changes in light spectrum and regulate shade-avoidance responses. In tomato plants, far red light promotes shoot growth at the expense of root growth, but the underlying mechanism is not well understood. This study investigated the role of phytochromes and auxin transport in regulating shoot: root ratio. Results showed that phyB1/B2 mutants had a higher shoot: root ratio compared to the wildtype, and both genotypes responded to far red light with increased shoot: root ratio. Blocking auxin transport resulted in an increased shoot: root ratio for both genotypes under all light conditions. These findings suggest that phytochromes, possibly through affecting auxin transport, play a role in regulating shoot: root ratio in response to far red light.
ENVIRONMENTAL AND EXPERIMENTAL BOTANY
(2023)
Article
Materials Science, Multidisciplinary
Yaorong Luo, Hao Tian, Xu Li, Lan Chen, Yurong Yang, Di Wu
Summary: Using first-principles and particle swarm optimization methods, this study systematically investigated the crystal structural stability and electrical properties of AGeX(3) compounds (A = Li, Na, K, Rb, Cs; X = F, Cl, Br, I). Various new structural phases and their corresponding electrical properties were discovered, such as the P2(1)2(1)2(1) perovskite phase with intrinsic small polar vortices and antivortices in KGeCl3 and KGeBr3, which may lead to a gyrotropic phase transition. Additionally, ferroelectric phases were found in R3c (LiGeX3, NaGeX3), R3m (CsGeX3) and Pna2(1) (KGeX3, RbGeX3), including the new Pna2(1) phase with both proper and hybrid improper polarization. These findings highlight the promising applications of Ge-based halide compounds in ferroics and piezoelectrics.
Article
Physics, Multidisciplinary
Serhii Sorokin, Md Shadab Anwar, Gregor Hlawacek, Richard Boucher, Joao Salgado-Cabaco, Kay Potzger, Juergen Lindner, Juergen Fassbender, Rantej Bali
Summary: The transport behavior of a mesoscopic Fe60Al40 wire during a phase transition has been investigated. The relationship between normal resistivity and Hall resistivity shows two distinct transport regimes during the phase transition.
NEW JOURNAL OF PHYSICS
(2023)
Article
Physics, Applied
E. P. Skipetrov, N. S. Konstantinov, E. V. Bogdanov, A. V. Knotko, V. E. Slynko
Summary: The phase, elemental compositions, and galvanomagnetic properties of a single-crystal Pb1-x-ySnxNiyTe ingot synthesized by the Bridgman-Stockbarger method were studied. Microscopic inclusions enriched in nickel were found, along with a significant increase in hole concentration with increasing tin concentration along the ingot.
LOW TEMPERATURE PHYSICS
(2021)
Article
Physics, Applied
Natalia V. Morozova, Igor V. Korobeynikov, Sergey V. Ovsyannikov
Summary: The study showed that under high pressure, the thermoelectric power factor of SnTe can be significantly improved, with the orthorhombic phase stable over a wider pressure range. The thermopower of orthorhombic phase increases with bandgap expansion, possibly due to structural distortions.
APPLIED PHYSICS LETTERS
(2021)
Article
Physics, Applied
Natalia Morozova, Igor Korobeynikov, Elena G. Shkvarina, Alexey A. Titov, Alexander N. Titov, Sergey Ovsyannikov
Summary: The study shows that the electrical conductivity type of ZrTe2 crystals can be controlled by applying different pressures, toggling between n-type, p-type, and even metallization. This control offers a potential method for diversifying the applications of conductivity in next-generation nanoelectronic devices.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Inorganic & Nuclear
Saiana Khandarkhaeva, Timofey Fedotenko, Stella Chariton, Elena Bykova, Sergey V. Ovsyannikov, Konstantin Glazyrin, Hanns-Peter Liermann, Vitali Prakapenka, Natalia Dubrovinskaia, Leonid Dubrovinsky
Summary: The study discovered two previously unknown polymorphs of magnetite at extreme high-pressure high-temperature conditions and found various iron oxide phases formed during decomposition. Crystal-chemical analysis showed a high-spin to low-spin crossover in octahedrally coordinated Fe3+ under specific pressure range, which demonstrates the possible involvement of magnetite in the deep oxygen cycle.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Physical
Yu. S. Ponosov, D. Y. Novoselov
Summary: The study demonstrates that the shapes and energy positions of electronic continua are influenced by temperature and excitations symmetry. Experimental spectra were modeled using ab initio DFT electronic structure calculations, showing promising results.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Yu E. Khatchenko, M. Yakushev, C. Seibel, H. Bentmann, M. Orlita, V Golyashov, Y. S. Ponosov, N. P. Stepina, A. Mudriy, K. A. Kokh, O. E. Tereshchenko, F. Reinert, R. W. Martin, T. Kuznetsova
Summary: The study found that the Bi1.1Sb0.9Te2S crystals have high structural quality and exhibit properties of a topological insulator, with a bandgap of 0.36 eV and the Dirac point located 100 meV above the valence band maximum.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
E. P. Skipetrov, E. Bogdanov, B. B. Kovalev, L. A. Skipetrova, A. Knotko, A. Emelyanov, A. N. Taldenkov, V. E. Slynko
Summary: We synthesized a single-crystal Pb1-x-ySnxScyTe ingot and studied the magnetic properties of alloys cut from it. The samples exhibited paramagnetic contribution at low temperatures and high-temperature ferromagnetic ordering in p-type samples, with spin-glass-like behavior and ferromagnetic hysteresis loops detected at temperatures below 100 K.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Multidisciplinary
Natalia Morozova, Igor Korobeynikov, Nobuyoshi Miyajima, Sergey Ovsyannikov
Summary: Manipulating stress can greatly enhance the thermoelectric power factor and narrow the band gap of layered SnSe single crystals, offering a novel approach to improve the performance of thermoelectric materials.
Article
Chemistry, Multidisciplinary
Samar Layek, Eran Greenberg, Stella Chariton, Maxim Bykov, Elena Bykova, Dmytro M. Trots, Alexander Kurnosov, Irina Chuvashova, Sergey Ovsyannikov, Ivan Leonov, Gregory Kh Rozenberg
Summary: The metal-insulator transition driven by electronic correlations is a fundamental concept in condensed matter physics, and it is often accompanied by charge ordering in mixed-valence compounds. In this study, the properties of mixed-valence Fe4O5 under high pressure were investigated using experimental and computational methods, revealing a series of electronic and magnetic-state transitions.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Physical
Elena Bykova, Erik Johansson, Maxim Bykov, Stella Chariton, Hongzhan Fei, Sergey V. Ovsyannikov, Alena Aslandukova, Stefan Gabel, Hendrik Holz, Benoit Merle, Bjorn Alling, Igor A. Abrikosov, Jesse S. Smith, Vitali B. Prakapenka, Tomoo Katsura, Natalia Dubrovinskaia, Alexander F. Goncharov, Leonid Dubrovinsky
Summary: A new class of rhenium borides with attractive mechanical, electronic, and other properties was identified. These compounds have a unique structural organization and potential for synthesizing new compounds with similar properties.
CHEMISTRY OF MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Patrick M. Braun, Robert J. Green, Leonid Dubrovinsky, Sergey V. Ovsyannikov, Alexander Moewes
Summary: Novel manganese phases, perovskite zeta-Mn2O3 and ilmenite epsilon-Mn2O3, were synthesized under high-pressure and high-temperature conditions. The electronic structure of these compounds was explored using X-ray absorption and X-ray emission spectroscopy techniques. The analysis of spectroscopy data allowed the determination of the concentration of different atomic sites and the characterization of crystal field and charge transfer processes near the Mn2+ crystal sites.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Materials Science, Multidisciplinary
Natalia V. Morozova, Aleksandr Yu. Usik, Igor V. Korobeinikov, Alexander N. Titov, Sergey V. Ovsyannikov
Summary: A semiconductor-metal transition was observed in Cu-intercalated TiSe2 single crystals (x <= 0.1) at room temperature under mechanical stress. The crystals can be transformed from semiconductors to metals by applying a stress of 1-3 GPa. This suggests the potential application of CuxTiSe2 crystals in optoelectronic micro-devices where their characteristics can be controlled by stress or strain.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Chemistry, Inorganic & Nuclear
Sergey V. Ovsyannikov, Alexander E. Karkin, Igor V. Korobeinikov, Natalia V. Morozova, Maxim Bykov, Elena Bykova, Leonid Dubrovinsky
Summary: The researchers synthesized Fe4O5 single and polycrystals with a CaFe3O5-type structure and investigated their electronic properties. The Fe4O5 crystals demonstrated semimetal electrical conductivity under ambient conditions, with contributions from both octahedral and trigonal-prismatic iron cations. The study suggests that Fe4O5 can serve as a model for understanding other mixed-valence iron oxides and designing novel complex ones.
DALTON TRANSACTIONS
(2023)
Article
Materials Science, Multidisciplinary
Alena Aslandukova, Andrey Aslandukov, Dominique Laniel, Saiana Khandarkhaeva, Gerd Steinle-Neumann, Timofey Fedotenko, Sergey V. Ovsyannikov, Yuqing Yin, Fariia Iasmin Akbar, Konstantin Glazyrin, Michael Hanfland, Leonid Dubrovinsky, Natalia Dubrovinskaia
Summary: A high-pressure yttrium allotrope, hP3-Y, was synthesized and its stability and electronic properties were studied. Derivative hydrides, hP3-YHx, with different hydrogen contents were also synthesized. Similar structures were found for hP3-NdHx and hP3-GdHx hydrides. These results are significant for understanding the behavior and properties of materials under high pressure.
Article
Chemistry, Physical
Elena Bykova, Sergey Ovsyannikov, Maxim Bykov, Yuqing Yin, Timofey Fedotenko, Hendrik Holz, Stefan Gabel, Benoit Merle, Stella Chariton, Vitali B. Prakapenka, Natalia Dubrovinskaia, Alexander F. Goncharov, Leonid Dubrovinsky
Summary: This study reported the successful synthesis of single crystals of the stoichiometric WB4 phase under high-pressure high-temperature conditions, with a hardness reaching the level of superhard materials.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
