Article
Physics, Multidisciplinary
Jean-Come Philippe, Alexis Lespinas, Jimmy Faria, Anne Forget, Dorothee Colson, Sarah Houver, Maximilien Cazayous, Alain Sacuto, Indranil Paul, Yann Gallais
Summary: Anisotropic strain selectively affects the role of nematic fluctuations in promoting superconductivity. Our results confirm the significance of nematic fluctuations in electron pairing.
PHYSICAL REVIEW LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Yu Zhang, Ying Su, Lin He
Summary: Vortices in graphene induced by single carbon defects can be considered as atomic-scale vortices mediated by pseudospin, with angular momenta of +2 and -2. Quantum interference measurements show that these vortices cancel each other, resulting in zero total angular momentum or aggregate chirality similar to a single vortex of the majority.
Article
Materials Science, Multidisciplinary
Jaafar N. Ansari, Karen L. Sauer, Igor I. Mazin
Summary: In this study, the effect of Co doping on the real-space nematic fluctuations in BaFe2As2 is investigated by combining nuclear magnetic resonance data with first-principles calculations. It is found that the dynamics of nematic fluctuations are exceptionally slow even in the formally tetragonal phase.
Article
Chemistry, Multidisciplinary
Tsang-Wei Matt Chen, Yuki Tanaka, Yohei Kametani, Kum-Yi Cheng, Chih-Hsun Lin, Yi Rick Lin, Ting-Rong Hsu, Zuqian Chen, Jiping Hao, Shigeki Mori, Yoshihito Shiota, Kazunari Yoshizawa, Hiroyuki Furuta, Soji Shimizu, Chun-Hsien Chen
Summary: This study scrutinizes the spontaneous assembly of antiaromatic compounds at the liquid-solid interface using scanning tunneling microscopy (STM). The research reveals the polymorphism in monolayers characterized by orthogonal and parallel assemblies at different concentrations. The parallel assembly is found to be more stable and dominantly formed at higher concentrations. Moreover, the narrowing of the HOMO-LUMO gap suggests significant molecular orbital interactions.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Materials Science, Multidisciplinary
Michael Merz, Liran Wang, Thomas Wolf, Peter Nagel, Christoph Meingast, Stefan Schuppler
Summary: Nematic phase transitions in high-temperature superconductors significantly affect their electronic properties. BaFe2As2 and BaNi2As2, sharing a common crystal structure, exhibit different characteristics in the nematic transitions. The presence of an additional phase with broken symmetry and orbital order in Ba(Ni, Co)(2)(As, P)(2) suggests a potential role of charge/orbital fluctuations in inducing nematicity.
Article
Physics, Multidisciplinary
Haruyasu Sato, Mitsuhiro Akatsu, Ryosuke Kurihara, Yoshiaki Kobayashi, Yuichi Nemoto
Summary: The critical properties originating from degenerate orbitals at the ferro-quadrupole quantum critical point (QCP) in the iron pnictide superconductor Ba(Fe1-xCox)2As2 were investigated through ultrasonic experiments. The temperature dependence of various parameters, such as the elastic soft mode C66, Jahn-Teller energy Delta Q, Weiss temperature Theta Q, and hexadecapole susceptibility ultrasonic attenuation coefficient alpha 66, near the QCP were found to exhibit significant changes. The unconventional critical exponent z nu was observed to be 3 near the QCP, suggesting enhanced quantum fluctuations. These observations indicate the potential key role of order parameter fluctuations in the superconductivity.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2023)
Article
Chemistry, Multidisciplinary
Desheng Pan, Bin Xiao, Qing Wang, Hong Wang
Summary: Chemical conversion is used to synthesize advanced nanomaterials with specific characteristics. In this study, a chemical conversion route driven by trioctylphosphine was used to transform lamellar Fe1-xCoxS1.2-DETA inorganic-organic hybrid solid solutions into 2D single-crystal Fe1-xCox alloy with controllable composition and dimensionality. The prepared Fe0.7Co0.3 alloy showed the highest magnetization, demonstrating the versatility of the chemical conversion strategy.
CHEMICAL COMMUNICATIONS
(2021)
Review
Chemistry, Physical
Bertold Rasche
Summary: Superconductivity remains a puzzling phenomenon despite over a century of research, particularly in the case of unconventional superconductors. Electrochemistry offers a unique advantage in studying superconducting behavior by allowing changes to the thermodynamic ground state and synthesis of compounds.
CURRENT OPINION IN ELECTROCHEMISTRY
(2021)
Article
Materials Science, Multidisciplinary
Wenli Bi, Zachary Nix, Utpal Dutta, Jiyong Zhao, Esen E. Alp, Dongzhou Zhang, Paul Chow, Yuming Xiao, Ya-Bin Liu, Guang-Han Cao, Yogesh K. Vohra
Summary: High-pressure experiments on 112-type iron-pnictides have shown significant changes in magnetic behaviors and lattice parameters under different pressures, with Ni-doping leading to a lower critical pressure for collapse of local magnetic order. The suppression of local-moment magnetism is associated with a significant increase of mean valence in Eu ions in both systems.
Article
Chemistry, Multidisciplinary
Jun Fujii, Barun Ghosh, Ivana Vobornik, Anan Bari Sarkar, Debashis Mondal, Chia-Nung Kuo, Francois C. Bocquet, Lixue Zhang, Danil W. Boukhvalov, Chin Shan Lue, Amit Agarwal, Antonio Politano
Summary: This study reveals surface-termination-dependent topological electronic states in mitrofanovite Pt3Te4, demonstrating its topological metal properties and the possibility of realizing two distinct electronic configurations with topological features on the surface of the same material.
Article
Thermodynamics
Stefano Veronesi, Mario Commodo, Luca Basta, Gianluigi De Falco, Patrizia Minutolo, Nikolaos Kateris, Hai Wang, Andrea D'Anna, Stefan Heun
Summary: In this study, the morphological and electronic properties of incipient soot particles formed during combustion were investigated using STM and STS techniques. The results revealed the size and semiconductor behavior of the incipient soot particles.
COMBUSTION AND FLAME
(2022)
Article
Materials Science, Multidisciplinary
Robert G. Moore, Satoshi Okamoto, Haoxiang Li, William R. Meier, Hu Miao, Ho Nyung Lee, Makoto Hashimoto, Donghui Lu, Elbio Dagotto, Michael A. McGuire, Brian C. Sales
Summary: This study investigates the complex interplay between magnetic moments and topological electronic structures in materials with kagome lattices through experiments and calculations. The results show that the variation of magnetic moments may affect the energy of topological surface bands, but no gap opening is observed during the temperature-dependent magnetic phase transition.
Article
Chemistry, Physical
S. Shanmukharao Samatham, Akhilesh Kumar Patel, Alexey Lukoyanov, K. G. Suresh, R. Nirmala
Summary: The structural and magnetic properties of Co substituted TiFe2 were investigated. It was found that TiFe2 and TiFeCo crystallize in hexagonal structure, while TiCo2 crystallizes in cubic structure. TiFeCo exhibits a magnetic transition behavior, while TiCo2 shows compensated ferrimagnetism.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Nanoscience & Nanotechnology
Ganbat Duvjir, Jee-Ahn Jung, Trinh Thi Ly, Nguyen Huu Lam, Young Jun Chang, Sunghun Lee, Hanchul Kim, Jungdae Kim
Summary: In this study, the fine structure and charge distribution of the charge density wave (CDW) phase in VTe2 were investigated using a combination of scanning tunneling microscopy (STM) and density functional theory (DFT) calculations. The results provide valuable insights for further research on the electronic structure of VTe2.
Article
Physics, Applied
Rajyavardhan Ray, A. K. Himanshu, Golak K. Mandal, Uday Kumar, S. N. Jha, N. Patra, D. Bhattacharya, A. B. Shinde, Manuel Richter, P. S. R. Krishna
Summary: The study resolved the discrepancies over the structural details of Ba(Fe1/2Nb1/2)O-3 ceramics through X-ray diffraction and neutron powder diffraction measurements, revealing a cubic structure. An appropriate value of U for DFT+U calculations was obtained through comparison with X-ray absorption spectroscopy.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Masaro Yoshida, Jianting Ye, Yijin Zhang, Yasuhiko Imai, Shigeru Kimura, Akihiko Fujiwara, Terukazu Nishizaki, Norio Kobayashi, Masaki Nakano, Yoshihiro Iwasa
Article
Physics, Multidisciplinary
Y. Sato, S. Kasahara, H. Murayama, Y. Kasahara, E. -G. Moon, T. Nishizaki, T. Loew, J. Porras, B. Keimer, T. Shibauchi, Y. Matsuda
Article
Nanoscience & Nanotechnology
Yuta Honma, Keisuke Itoh, Hiroyasu Masunaga, Akihiko Fujiwara, Terukazu Nishizaki, Satoshi Iguchi, Takahiko Sasaki
ADVANCED ELECTRONIC MATERIALS
(2018)
Article
Physics, Applied
Masaki Mito, Yuichiro Kitamura, Takayuki Tajiri, Kazuma Nakamura, Ryo Shiraishi, Kazuma Ogata, Hiroyuki Deguchi, Tomiko Yamaguchi, Nao Takeshita, Terukazu Nishizaki, Kaveh Edalati, Zenji Horita
JOURNAL OF APPLIED PHYSICS
(2019)
Article
Materials Science, Multidisciplinary
Terukazu Nishizaki, Kaveh Edalati, Seungwon Lee, Zenji Horita, Tadahiro Akune, Tsutomu Nojima, Satoshi Iguchi, Takahiko Sasaki
MATERIALS TRANSACTIONS
(2019)
Article
Materials Science, Multidisciplinary
Masaki Mito, Shun Shigeoka, Hirotaka Kondo, Nozomi Noumi, Yuichiro Kitamura, Kunihiko Irie, Kazuma Nakamura, Seishi Takagi, Hiroyuki Deguchi, Takayuki Tajiri, Mamoru Ishizuka, Terukazu Nishizaki, Kaveh Edalati, Zenji Horita
MATERIALS TRANSACTIONS
(2019)
Article
Chemistry, Inorganic & Nuclear
Jiro Kitagawa, Genta Yakabe, Akinori Nakayama, Terukazu Nishizaki, Masami Tsubota
JOURNAL OF SOLID STATE CHEMISTRY
(2020)
Article
Physics, Applied
Tomoyuki Naito, Terukazu Nishizaki, Norio Kobayashi
Summary: The study focused on the phase transition of vortices induced by current flow in untwinned YBa 2 Cu 3 O 7 - delta single crystals. Near the first-order melting transition line, changes in electrical resistivity, hysteresis behavior, and voltage-current characteristics were observed, indicating the current-induced melting of the vortex lattice.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Nanoscience & Nanotechnology
Jiro Kitagawa, Masaki Fukuda, Satoshi Fukuda, Kenta Fujiki, Yuki Nakamura, Terukazu Nishizaki
Summary: We report the discovery of ferromagnetism in the cubic CsCl-type Ti21 similar to 25Nb20 similar to 24Cr5 similar to 10Ru similar to 49 multicomponent alloy. The purest sample exhibits ferromagnetism with a Curie temperature of 38 K. The study also reveals the ferromagnetic exchange interaction between the localized Cr magnetic moments. Furthermore, the effect of elemental substitution on the ferromagnetic behavior is investigated.
Article
Engineering, Electrical & Electronic
Tetsuro Sueyoshi, Satoshi Semboshi, Toshinori Ozaki, Hitoshi Sakane, Terukazu Nishizaki, Norito Ishikawa
Summary: In this study, the morphologies of ion tracks in GdBCO coated conductors irradiated with 80 MeV Xe ions were investigated using transmission electron microscopy. It was found that segmental columnar defects were produced along the c-axis when irradiated with ions along this direction, while thick and elongated continuous defects were formed when the ion beam was tilted at a slight angle from the c-axis. The depth of continuous defects increased with larger tilting angles from the c-axis. The variation in microstructure was attributed to the anisotropic thermal diffusivity in high-Tc superconductors.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2022)
Article
Engineering, Electrical & Electronic
Tetsuro Sueyoshi, Toshinori Ozaki, Satoshi Semboshi, Hitoshi Sakane, Terukazu Nishizaki, Norito Ishikawa
Summary: A variety of irradiation defects were introduced into NdBa2Cu3Oy thin films, ranging from columnar defects to spherical ones. The highest critical current density J(c) was obtained when spherical defects were installed at a matching field of B-phi = 10 T. In contrast, the J(c) of the irradiation with elongated columnar defects increased only up to B-phi = 5 T, resulting in a lower value.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2023)
Article
Nanoscience & Nanotechnology
Yuito Nakamura, Koshin Takeshita, Terukazu Nishizaki, Jiro Kitagawa
Summary: The structural and magnetic properties of high-entropy RNi (R = Dy, Tb1/3Dy1/3Ho1/3, and Gd1/5Tb1/5Dy1/5Ho1/5Er1/5) were investigated. The lattice parameters were largely unaffected by the increase of configurational entropy, and all compounds exhibited a ferromagnetic ground state. The replacement of Dy with Tb + Ho did not affect the magnetic ordering temperature, but introduced an additional magnetic anomaly. The magnetic entropy change showed a similar dependence on configurational entropy as the temperature derivative of the magnetic susceptibility. The anisotropy of rare-earth magnetic moments in the high-entropy state could be used to enhance magnetocaloric properties.
Article
Materials Science, Multidisciplinary
R. Ogawa, F. Nabeshima, T. Nishizaki, A. Maeda
Summary: The Hall angle of the vortex motion in cuprates was found to be independent of the magnetic field in BSCCO, reaching unity at low temperatures, while in YBCO, the angle increased with increasing magnetic field even at low temperatures. The difference in the magnetic field dependence of the Hall angle was attributed to the varying influence of pinning originating from differences in the vortex state between the two materials. Both materials exhibited a significantly large tangent of the Hall angle at low temperatures, suggesting possible nonlinearity in viscous drag force and hidden dissipation mechanisms. The unexpectedly large Hall angle observed in the flux-flow Hall effect study raises fundamental questions regarding the motion of quantized vortices in superconductors, warranting further investigation.
Proceedings Paper
Materials Science, Multidisciplinary
T. Yonenaka, E. S. Otabe, V. Vyatkin, S. Lee, T. Akune, T. Nishizaki
31ST INTERNATIONAL SYMPOSIUM ON SUPERCONDUCTIVITY (ISS2018)
(2019)
Article
Materials Science, Multidisciplinary
H. Huang, H. Jang, M. Fujita, T. Nishizaki, Y. Lin, J. Wang, J. Ying, J. S. Smith, C. Kenney-Benson, G. Shen, W. L. Mao, C. -C. Kao, Y. -J. Liu, J. -S. Lee
