Article
Multidisciplinary Sciences
S. Khim, J. F. Landaeta, J. Banda, N. Bannor, M. Brando, P. M. R. Brydon, D. Hafner, R. Kuechler, R. Cardoso-Gil, U. Stockert, A. P. Mackenzie, D. F. Agterberg, C. Geibel, E. Hassinger
Summary: Materials with multiple superconducting phases are rare, but CeRh2As2 has been discovered to exhibit two-phase unconventional superconductivity. The high critical field of 14 tesla in its high-field phase, combined with a transition between different superconducting phases in a c-axis magnetic field, is likely related to the local inversion-symmetry breaking and staggered Rashba coupling introduced at the cerium sites.
Article
Materials Science, Multidisciplinary
Gao-Wei Qiu, Yi Zhou
Summary: Under the influence of a magnetic field, two weakly linked superconducting ultrathin films exhibit different superconducting states, with one characterized by staggered supercurrent loops and a superfluid density wave, and the other by uniform superfluid density. The phase transition between these two states falls within a specific universality class.
Article
Multidisciplinary Sciences
Katsuki Kinjo, Hiroki Fujibayashi, Hiroki Matsumura, Fumiya Hori, Shunsaku Kitagawa, Kenji Ishida, Yo Tokunaga, Hironori Sakai, Shinsaku Kambe, Ai Nakamura, Yusei Shimizu, Yoshiya Homma, Dexin Li, Fuminori Honda, Dai Aoki
Summary: Recently discovered topological superconductor uranium ditelluride exhibits multiple superconducting phases under different pressures. Nuclear magnetic resonance and ac susceptibility measurements confirm spin-triplet superconductivity in one of the phases and reveal the spin degrees of freedom in uranium ditelluride.
Article
Multidisciplinary Sciences
Kousuke Ishida, Yugo Onishi, Masaya Tsujii, Kiyotaka Mukasa, Mingwei Qiu, Mikihiko Saito, Yuichi Sugimura, Kohei Matsuura, Yuta Mizukami, Kenichiro Hashimoto, Takasada Shibauchi
Summary: This study demonstrates the presence of a diverging nematic susceptibility electronic nematic QCP in nonmagnetic FeSe1-x Te-x. In contrast to FeSe1-x S-x, FeSe1-x Te-x exhibits a superconducting dome centered at the QCP. This difference is related to the relative strength of nematic and spin fluctuations.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Materials Science, Multidisciplinary
Niels Henrik Aase, Asle Sudbo
Summary: This study investigates how spin fluctuations can induce superconductivity in a strongly correlated non-Fermi liquid with repulsive electronic interactions. By using a multichannel Luttinger liquid approach, the researchers find that spin-polarized triplet superconducting correlations persist in the system with sufficiently large interchain couplings.
Article
Chemistry, Physical
Dan Zhang, Yanhui Dong, Daguang Li, Heng Jia, Weiping Qin
Summary: Using an automatic nanomaterial synthesizer (ANS), researchers performed precise synthesis to explore the growth regularity of complex NaREF4 (RE: rare earth) upconversion nanocrystals (UCNCs). By controlling the concentration of Y3+, they found that UCNCs can continuously vary their sizes to meet the experimenter's design, and visually demonstrated the growth regularity in growth phase diagrams.
Article
Materials Science, Multidisciplinary
S. Holenstein, F. Hummel, Z. Guguchia, S. Kamusella, N. Barbero, H. Ogino, Z. Shermadini, R. Khasanov, A. Amato, T. Shiroka, H-H Klauss, E. Morenzoni, D. Johrendt, H. Luetkens
Summary: The relationship between magnetism and superconductivity in Sr2VO3FeAs under pressure undergoes a complex evolution, with a possible cooperative coupling between superconducting and magnetic orders as the pressure changes.
Article
Materials Science, Multidisciplinary
Yue Sun, Yongqiang Pan, Nan Zhou, Xiangzhuo Xing, Zhixiang Shi, Jinhua Wang, Zengwei Zhu, Akira Sugimoto, Toshikazu Ekino, Tsuyoshi Tamegai, Haruhisa Kitano
Summary: A systematic study was conducted on the superconducting and normal-state anisotropy of Fe1+yTe0.6Se0.4 single crystals with controlled excess Fe levels, revealing an increase in the anisotropy of effective mass with excess Fe. While the superconducting state shows almost isotropic behavior at low temperatures, a significant anisotropy is observed near T-c in the normal state. The discrepancy in anisotropies between the SC and normal states is attributed to the large anisotropy of scattering time tau(ab)/tau(c).
Review
Physics, Applied
Peng Liu, Bin Lei, Xianhui Chen, Lan Wang, Xiaolin Wang
Summary: This review summarizes recent advances in electric-field-gated superconductivity in various ultrathin superconducting materials, including iron-based superconductors, transition-metal dichalcogenides, honeycomb bilayer superconductors, and cuprates. It highlights the power of electric-double-layer transistors and ionic field-effect transistors as electric-field gating strategies, and offers a perspective on open challenges and future development paths in this field.
NATURE REVIEWS PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
Han-Fang Zhang, Xing-Hong Chen, Qi-Ling Xiao, Fei Chen, Zhenjie Feng, Shixun Cao, Jincang Zhang, Yanpeng Qi, Zhixiang Shi, Jun-Yi Ge
Summary: By preparing high-quality Fe1.1Se0.8Te0.2 films on the CaF2 substrate via pulsed laser deposition, the study reveals the relationship between film thickness, structure evolution, and superconductivity. The thick films are found in a metastable state with a fragile balance between increased strain energy and large compressive stress, leading to a unique structure avalanche phenomenon. This research provides insights into the optimization of critical temperature in FeSeTe films and offers a method for fabricating free-standing single-phase FeSeTe crystals in the phase-separation regime.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Physics, Multidisciplinary
H. Huang, S-J Lee, Y. Ikeda, T. Taniguchi, M. Takahama, C-C Kao, M. Fujita, J-S Lee
Summary: The presence of a small concentration of in-plane Fe dopants in La1.87Sr0.13Cu0.99Fe0.01O4 is known to enhance stripelike spin and charge density wave (SDW and CDW) order, suppress the superconducting T-c, and induce highly two-dimensional superconducting correlations, which are argued to be signatures of a new form of superconducting order, the pair density wave (PDW) order. This two-dimensional superconducting fluctuation is strongly associated with the CDW stripe, and the PDW signature appears when the correlation length of the CDW stripe grows over eight times the lattice unit.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Applied
Jia-Ying Zhang, Ya-Xun He, Qi-Ling Xiao, Jun-Yi Ge
Summary: Fe y Se x Te1-x targets and films with different Fe contents were prepared, and the effect of Fe content on the structure and superconductivity of Fe y Se x Te1-x superconductors was investigated. It was found that higher Fe content led to lower superconductivity, while Fe vacancies and higher Se content improved the superconducting properties.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2023)
Article
Physics, Multidisciplinary
Jing Liu, Qing-Wei Wang, Liang-Jian Zou
Summary: This theoretical study investigates superconductivity in multiorbital superconductors based on a three-orbital tight-binding model, revealing a two-dome structure in the T-c-n phase diagram. The competition between different orbital pairings leads to the presence of two superconducting domes, with the boundary of each dome significantly affected by the matrix elements of J(1) and J(2).
Article
Chemistry, Physical
Nuur Syahidah Sabran, Iman Aris Fadzallah, Mohd Faizul Mohd Sabri, Takahito Ono
Summary: This study synthesized indium-doped cobalt triantimonide thick films using an electrochemical deposition technique and found that doping improved their thermoelectric performance.
JOURNAL OF MATERIOMICS
(2023)
Article
Physics, Applied
Junichi Shiogai, Atsushi Tsukazaki
Summary: In this study, a freestanding single-crystalline FeSe membrane was prepared using a water-soluble Sr3Al2O6 sacrificial layer as a growth template. The FeSe membrane was fully relaxed with minimal degradation of its structural properties during the lift-off process. The freestanding FeSe membrane exhibited superconductivity below 4.2 K, while it was not observed in a compressed thin-film form.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Multidisciplinary
Kota Kataoka, Dirk Wulferding, Takeshi Yajima, Daisuke Nishio-Hamane, Daigorou Hirai, Seungyeol Lee, Kwang-Yong Choi, Zenji Hiroi
Summary: The substitution effects of Os for Ru in alpha-RuCl3 were investigated in a wide composition range of Ru1-x-OsxCl3, revealing a rich phase diagram including antiferromagnetic order, spin-singlet dimer phase, and magnetic short-range order. It was found that Ru Os pairs tend to form dimers triggering a first-order transition at low substitutions, leading to molecular orbital crystallization in a highly disordered system.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2022)
Article
Physics, Multidisciplinary
Daigorou Hirai, Toshiya Ikenobe, Takahiro Yamada, Hisanori Yamane, Zenji Hiroi
Summary: NaAlSi is a quasi-two-dimensional semimetal with unique band structure and superconductivity. Electrical resistivity measurements reveal a significant reduction in resistivity in a transitional region above the bulk superconducting regime, but only when the magnetic fields are perpendicular to the plane. This suggests the presence of fractional superconductivity on the side surface of the crystal, indicating an upper critical field higher than the bulk superconductivity.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2022)
Article
Physics, Multidisciplinary
Takahiro Yamada, Daigorou Hirai, Tamio Oguchi, Hisanori Yamane, Zenji Hiroi
Summary: We investigate the electronic properties of NaAlGe and find that it exhibits an unusual ground state with a small pseudogap close to the Fermi level. Unlike NaAlSi, NaAlGe does not show superconductivity, and we propose that the formation of the pseudogap in NaAlGe is due to an unexpected Fermi surface instability rather than the electron-phonon instability that leads to superconductivity in NaAlSi.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2022)
Article
Physics, Multidisciplinary
Shinya Uji, Taichi Terashima, Daigorou Hirai, Takahito Anbai, Zenji Hiroi
Summary: Magnetic torque measurements were conducted to investigate the electronic state of metallic beta-phase ReO2 with Dirac nodal lines forming a loop chain. The experimental results showed sinusoidal torque curves with a two-fold symmetry throughout the entire temperature range. As the temperature decreased, a significant nonlinear magnetization effect was observed, especially for the magnetic field in the ac plane. Analysis based on Landau theory revealed that this change in torque signal was attributed to electric quadrupole fluctuations. Furthermore, the study found a strongly enhanced anisotropic susceptibility due to quadrupole fluctuations near 0K and 0T, suggesting the presence of quantum critical behavior.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2022)
Article
Chemistry, Multidisciplinary
Daigorou Hirai, Keita Kojima, Naoyuki Katayama, Mitsuaki Kawamura, Daisuke Nishio-Hamane, Zenji Hiroi
Summary: Some inorganic solids undergo phase transitions that result in the formation of molecules, which significantly impact their physical properties.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Physics, Applied
Yuki Kubota, Yoshihiko Okamoto, Tomoya Kanematsu, Takeshi Yajima, Daigorou Hirai, Koshi Takenaka
Summary: Sintered samples of Cr3Te4 and Cr2Te3 show large strains and volume changes under a magnetic field. The volume of Cr3Te4 increases by delta V/V = 500-1170 ppm when a magnetic field of 9 T is applied below 350 K. At room temperature, the delta V/V value exceeds 1000 ppm, which is larger than previously reported values for Cr-based magnets and comparable to forced-volume magnetostriction in invar alloys. Cr2Te3 exhibits a large delta V/V of 680 ppm when a magnetic field of 9 T is applied at 200 K. Both samples show significant volume increases around the Curie temperature, along with negative thermal expansion due to microstructural effects, suggesting the importance of the interaction between anisotropic lattice deformation and microstructural effects for the large magnetic-field-induced volume changes.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Inorganic & Nuclear
Hiroki Yamamoto, Kohei Tada, Jinkwang Hwang, Daigorou Hirai, Zenji Hiroi, Kazuhiko Matsumoto, Rika Hagiwara
Summary: This study investigates the reaction mechanisms behind the reductive fluorination of WO3 using polytetrafluoroethylene (PTFE) in an Ni reactor. The gas-solid reaction paths are analyzed using infrared spectroscopy, revealing C2F4, C3F6, and i-C4F8 to be the reactive components in the PTFE-decomposition gas during the reactions with WO3 at 500 degrees C. CO2 and CO are identified as gaseous byproducts of the reaction.
INORGANIC CHEMISTRY
(2023)
Article
Physics, Condensed Matter
Daigorou Hirai, Atsuhito Fukui, Hajime Sagayama, Takumi Hasegawa, Zenji Hiroi
Summary: The 5d pyrochlore oxide superconductor Cd2Re2O7 undergoes a phase transition to an odd-parity multipole phase by breaking the spatial inversion symmetry due to strong spin-orbit coupling. High-resolution synchrotron radiation x-ray diffraction experiments reveal the temperature-dependent splitting of certain reflections, indicating simultaneous inversion symmetry breaking and tetragonal distortion. Multiple transitions and a new orthorhombic phase are identified, each corresponding to a distinct odd-parity multipole order.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Chemistry, Inorganic & Nuclear
EliseAnne C. C. Koskelo, Nicola D. D. Kelly, Liam A. V. Nagle-Cocco, Joshua D. D. Bocarsly, Paromita Mukherjee, Cheng Liu, Qiang Zhang, Sian E. Dutton
Summary: By adjusting different parameters of fcc lanthanide oxides, such as chemical pressure via the A site cation and the magnetic ground state via the lanthanide ion, the magnetocaloric effect can be maximized for magnetic refrigeration design. This study also introduces the Ca(2)LnSbO(6) series with tunable site disorder that can control the deviations from Curie-Weiss behavior.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Inorganic & Nuclear
Daigorou Hirai, Naoto Uematsu, Koh Saitoh, Naoyuki Katayama, Koshi Takenaka
Summary: New high-entropy antimonides, M1-x Pt x Sb (M = equimolar Ru, Rh, Pd, and Ir), were successfully synthesized through a conventional solid-state reaction and subsequent quenching. Physical property measurements of single-phase M1-x Pt x Sb (x = 0.2) samples revealed a bulk superconducting transition at 2.15(2) K.
INORGANIC CHEMISTRY
(2023)
Article
Physics, Condensed Matter
Daigorou Hirai, Takahito Anbai, Takako Konoike, Shinya Uji, Yuya Hattori, Taichi Terashima, Hajime Ishikawa, Koichi Kindo, Naoyuki Katayama, Tamio Oguchi, Zenji Hiroi
Summary: Quantum oscillations were measured in the magnetic torque and electrical resistivity of ss-ReO2 to examine its electronic structure. The observed de Haas-van Alphen oscillation branches were consistent with first-principles calculations that predicted the presence of four Fermi surfaces. The small-electron Fermi surface exhibited a very small cyclotron mass, only 0.059 times that of free electrons, which suggests a linear dispersion of the energy band. These findings support the existence of the predicted hourglass nodal chain in ss-ReO2 near the Fermi energy.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Physics, Multidisciplinary
Yusaku Shinoda, Yoshihiko Okamoto, Youichi Yamakawa, Haruka Matsumoto, Daigorou Hirai, Koshi Takenaka
Summary: We report the discovery of bulk superconductivity in Sc6MTe2 with seven kinds of transition-metal elements M. The critical temperatures for M=3d elements are higher than those for 4d and 5d elements and increase in the order of M=Ni, Co, and Fe with the highest Tc of 4.7 K in Sc6FeTe2. First principles calculations indicate the presence of significant contribution of Fe 3d orbitals at the Fermi energy, which most likely enhance the Tc of Sc6FeTe2. The upper critical field for M=Os is considerably enhanced by the strong spin-orbit coupling. These results demonstrate Sc6MTe2 to be a unique family of d-electron superconductors, where d electrons of 3d and 5d M atoms strongly influence the superconducting properties.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2023)
Article
Materials Science, Multidisciplinary
Toshiya Ikenobe, Takahiro Yamada, Daigorou Hirai, Hisanori Yamane, Zenji Hiroi
Summary: Despite having similar electronic structures, NaAlSi and NaAlGe have significantly different ground states. NaAlSi exhibits superconductivity while NaAlGe exhibits semiconductive electrical conductivity at low temperatures, indicating the formation of a pseudogap. The pseudogap in NaAlGe is suppressed with increasing Zn content, followed by the appearance of a superconducting dome with a transition temperature of 2.8 K, most likely resulting from excitonic fluctuations.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Kevin Maik Jablonka, Qianxiang Ai, Alexander Al-Feghali, Shruti Badhwar, Joshua D. Bocarsly, Andres M. Bran, Stefan Bringuier, L. Catherine Brinson, Kamal Choudhary, Defne Circi, Sam Cox, Wibe A. de Jong, Matthew L. Evans, Nicolas Gastellu, Jerome Genzling, Maria Victoria Gil, Ankur K. Gupta, Zhi Hong, Alishba Imran, Sabine Kruschwitz, Anne Labarre, Jakub Lala, Tao Liu, Steven Ma, Sauradeep Majumdar, Garrett W. Merz, Nicolas Moitessier, Elias Moubarak, Beatriz Mourino, Brenden Pelkie, Michael Pieler, Mayk Caldas Ramos, Bojana Rankovic, Samuel G. Rodriques, Jacob N. Sanders, Philippe Schwaller, Marcus Schwarting, Jiale Shi, Berend Smit, Ben E. Smith, Joren Van Herck, Christoph Voelker, Logan Ward, Sean Warren, Benjamin Weiser, Sylvester Zhang, Xiaoqi Zhang, Ghezal Ahmad Zia, Aristana Scourtas, K. J. Schmidt, Ian Foster, Andrew D. White, Ben Blaiszik
Summary: This article presents a hackathon focused on exploring the diverse applications of large language models (LLMs) in molecular and materials science. Participants used LLMs for various applications and generated working prototypes, showcasing the profound impact of LLMs on the future of the fields and their potential benefits across scientific disciplines.
Article
Chemistry, Inorganic & Nuclear
Rosa Muller, Olivia Georghiades, Joshua D. Bocarsly, Farheen N. Sayed, Victor Riesgo-Gonzalez, Andrew D. Bond, Clare P. Grey, Dominic S. Wright
Summary: This study investigates the potential of lanthanide-containing polyoxotitanates as single-source precursors for hybrid oxides. The properties of the compounds were characterized using magnetic measurements, and their stability at high temperatures was observed.
DALTON TRANSACTIONS
(2023)