Article
Materials Science, Multidisciplinary
B. S. Jacobs, Abhishek Pandey
Summary: We have grown high-quality single crystals of BaMn2P2 and investigated their structural, electrical transport, thermal, and magnetic properties. Our results show that BaMn2P2 is an insulating compound with a small band gap and a collinear local-moment Neel-type antiferromagnetic ground state below T-N = 795(15) K. The magnetic transition temperatures show a dependence on the separation between the localized spins on the Mn ions. Short-range dynamic quasi-two-dimensional antiferromagnetic correlations are observed above T-N. The high T-N of BaMn2P2 calls for systematic hole-doping studies to explore its potential for coexisting antiferromagnetism and half-metallic ferromagnetism.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Multidisciplinary Sciences
Dushyant M. Narayan, Peipei Hao, Rafal Kurleto, Bryan S. Berggren, A. Garrison Linn, Christopher Eckberg, Prathum Saraf, John Collini, Peter Zavalij, Makoto Hashimoto, Donghui Lu, Rafael M. Fernandes, Johnpierre Paglione, Daniel S. Dessau
Summary: The study investigates the superconductivity of Ba1-xSrxNi2As2 series and finds that isovalent substitution weakens the charge and nematic orders but enhances the superconducting transition temperature. The analysis reveals the presence of reasonably nested electron and hole Fermi pockets with Ni d(xz)/d(yz) orbital compositions within the optimal substitution range, which are associated with the enhancement of nematic fluctuations.
Article
Materials Science, Multidisciplinary
Silvia Haindl, Sergey Nikolaev, Michiko Sato, Masato Sasase, Ian MacLaren
Summary: The study introduces a comprehensive classification of Fe-pnictide heterointerfaces based on electrostatic principles, successfully demonstrated on a novel Fe-pnictide heterostructure. By adding different cations/anions, either clean interfaces or interfacial layers can be produced, impacting superconductivity in the Fe-pnictide heterostructures.
NPG ASIA MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
A. A. Slobodchikov, I. A. Nekrasov, N. S. Pavlov, M. M. Korshunov
Summary: The band structure, density of states, and Fermi surface of the oxygen-deficient tungsten oxide WO2.9 (equivalent to W20O58) were studied using density functional theory. Despite the complexity of the structure, the low-energy band structure is feasible, mainly influenced by specific distortions in the structure.
Article
Materials Science, Multidisciplinary
Xiangang Wan, Vsevolod Ivanov, Giacomo Resta, Ivan Leonov, Sergey Y. Savrasov
Summary: The study investigated the magnetic exchange interactions of the superconductor Nd1-xSrxNiO2 using the density-functional-based LDA+U method and linear-response theory. It was found that hole doping significantly enhances the interlayer exchange coupling, while the Nd-5d states do not affect the magnetic exchange interactions and may not participate in the superconductivity of this compound. The analysis using dynamical mean field theory revealed an underlying Mott insulating state that leads to different quasiparticle band structures upon doping.
Article
Materials Science, Multidisciplinary
F. Parvin, S. H. Naqib
Summary: NaSn2P2, with a vdW structure, is a recently discovered superconducting system with intriguing electrical, optical, thermal, and superconducting properties. Investigation under various pressures reveals unique structural, electronic, optical, and superconducting features, making NaSn2P2 suitable for optoelectronic device applications.
RESULTS IN PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Qingguo Feng
Summary: LiOHFeSe, a layered material, has been extensively studied for its magnetic states and superconductivity. In this work, an isomer of LiOHFeSe containing FeO and LiSeH layers is computationally investigated, with a focus on electron correlation, electronic structures, magnetism, and optical properties. The results show that LiSeHFeO exhibits different absorption spectra at different magnetic states and has potential for a semiconductor-metal transition.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Physics, Multidisciplinary
Keisuke Higashi, Mathias Winder, Jan Kunes, Atsushi Hariki
Summary: By studying the core-level spectra, the optimal model parameters for the ground state of NdNiO2 were determined, showing that self-doping from the Nd 5d states prevents the opening of a Mott-Hubbard gap. However, the current calculations for LaNiO2 cannot explain the difference in spectra compared to NdNiO2.
Article
Physics, Multidisciplinary
R. Garreis, A. Knothe, C. Tong, M. Eich, C. Gold, K. Watanabe, T. Taniguchi, V Fal'ko, T. Ihn, K. Ensslin, A. Kurzmann
Summary: Transport measurements through a few-electron circular quantum dot in bilayer graphene show bunching of conductance resonances in groups of four, eight, and twelve, which are related to the spin and valley degeneracies. As the electron numbers increase, the single-particle ground state evolves into a threefold degenerate minivalley ground state, confirmed by measurements in a magnetic field. The importance of Hund's second rule for spin filling of quantum dot levels is emphasized, highlighting the effects of exchange interactions.
PHYSICAL REVIEW LETTERS
(2021)
Review
Chemistry, Physical
Jozef Deniszczyk, Andrzej Slebarski
Summary: In this study, X-ray photoelectron spectroscopy and ab initio electronic structure investigations were conducted on the skutterudite-related R5Rh6Sn18 superconductors with R = Sc, Y, and Lu. The research revealed that vacancies and atomic local defects play a role in enhancing the superconducting transition temperature Tc and determining the metallic or semimetallic behaviors of the materials. The band structure calculations showed the presence of a pseudogap that can be shifted by introducing vacancies. Furthermore, the study found that the densities of states are similar for different R5Rh6Sn18 compounds and are determined by the Rh d-and Sn s- and p-electron states.
Article
Chemistry, Physical
Xiaoyu Song, Sarah N. Schneider, Guangming Cheng, Jason F. Khoury, Milena Jovanovic, Nan Yao, Leslie M. Schoop
Summary: This study investigates the mechanism of oxidative deintercalation of KCrSe2, revealing that the solid-state diffusion of K+ cations is the rate-limiting step in the process. Additionally, the relationship between Cr-Cr distances and magnetic order changes suggests the possibility of switching between magnetic states in CrSe2 monolayers by varying lattice parameters.
CHEMISTRY OF MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Ze-Yi Song, Xiu-Cai Jiang, Xiao-Fang Ouyang, Yu-Zhong Zhang
Summary: The study found that the bicollinear antiferromagnetic state with antiparallel orbital magnetic moments on each iron, favored by Cu vacancies and violating Hund's rule, can explain the weak antiferromagnetism observed in CuFeAs experimentally. This suggests that a breakdown of Hund's rule may be the possible origin for reduced magnetism in iron pnictides, rather than magnetic fluctuations induced by electronic correlations.
Article
Multidisciplinary Sciences
Martin R. Otto, Jan-Hendrik Pohls, Laurent P. Rene de Cotret, Mark J. Stern, Mark Sutton, Bradley J. Siwick
Summary: This study investigates the electron-phonon coupling phenomena in 1T-TiSe2 using ultrafast electron diffuse scattering, distinguishing the contributions to phonon softening from different mechanisms. By selectively photo-doping carriers into the electron pocket, the researchers observe specific renormalization of soft zone-boundary phonon frequencies followed by electron-phonon equilibration.
Article
Physics, Multidisciplinary
Chunlong Wu, Qiang Wan, Cao Peng, Shangkun Mo, Renzhe Li, Keming Zhao, Yanping Guo, Shengjun Yuan, Fengcheng Wu, Chendong Zhang, Nan Xu
Summary: We conducted an experimental study on high-order moire ' pattern in graphene-monolayer xenon heterostructure. By adjusting the lattice constant of the xenon monolayer through annealing, we were able to tune the moire ' period from a few nanometers to +co in real-time. Using angle-resolved photoemission spectroscopy, we observed that the replicas of Dirac nodes moved closer and finally overlapped, resulting in a gap opening, as the moire ' pattern expanded and transformed into a Kekule ' distortion. Experimental results were explained by a moire ' Hamiltonian that coupled Dirac fermions from different valleys, indicating the presence of a narrow moire ' band. Our study provides a platform for studying the continuous evolution of moire ' patterns and offers an unprecedented approach for manipulating Dirac fermions with tunable intervalley coupling.
PHYSICAL REVIEW LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Refka Sai, Hatem Ezzaouia, Muaffaq M. Nofal
Summary: The self-consistent band structure and density of states of iron pyrite FeS2 were obtained using the LMTO-ASA method, revealing a direct band gap of 0.90508 eV that aligns with experimental measurements. The calculated density of states shows full occupation of the valence band and empty first conduction band.
RESULTS IN PHYSICS
(2021)
Correction
Physics, Applied
Y. Tanaka, H. Yamamori, T. Yanagisawa, T. Nishio, S. Arisawa
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
(2019)
Article
Physics, Multidisciplinary
Takashi Yanagisawa
PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS
(2019)
Article
Multidisciplinary Sciences
Takashi Yanagisawa
Article
Physics, Applied
Takashi Yanagisawa, Mitake Miyazaki, Kunihiko Yamaji
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
(2020)
Article
Multidisciplinary Sciences
Izumi Hase, Takashi Yanagisawa
Article
Chemistry, Inorganic & Nuclear
Hiroki Ninomiya, Terunari Koshinuma, Taichiro Nishio, Hiroshi Fujihisa, Kenji Kawashima, Izumi Hase, Shigeyuki Ishida, Hiraku Ogino, Akira Iyo, Yoshiyuki Yoshida, Yoshito Gotoh, Hiroshi Eisaki
INORGANIC CHEMISTRY
(2020)
Article
Chemistry, Inorganic & Nuclear
Makoto Minohara, Yuka Dobashi, Naoto Kikuchi, Akane Samizo, Kouhei Tsukuda, Keishi Nishio, Ko Mibu, Hiroshi Kumigashira, Izumi Hase, Yoshiyuki Yoshida, Yoshihiro Aiura
Summary: Oxide semiconductors usually lack bipolar conductivity, but bipolar semiconducting properties are demonstrated in α-SnWO4 after appropriate thermal treatment. The presence of Sn-4(+) substitutional defects on W-6(+) sites contributes to hole-carrier generation, and oxygen vacancies play a role in the transition of semiconducting properties from p-type to n-type.
INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Physical
Akira Iyo, Izumi Hase, Hiroshi Fujihisa, Yoshito Gotoh, Nao Takeshita, Shigeyuki Ishida, Hiroki Ninomiya, Yoshiyuki Yoshida, Hiroshi Eisaki, Hishiro T. Hirose, Taichi Terashima, Kenji Kawashima
Summary: In the recently discovered antiperovskite phosphide (Ca,Sr)Pd3P, centrosymmetric (CS) and non-centrosymmetric (NCS) superconducting phases appear with a large difference in transition temperatures (T-c), primarily attributed to the decrease in N(0) associated with the structural phase transition.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Takahiro Kato, Yuki Iwasa, Sugali Pavan Kumar Naik, Shigeyuki Ishida, Yoichi Higashi, Izumi Hase, Taichiro Nishio, Kenta Hongo, Ryo Maezono, Hiraku Ogino
Summary: Layered oxychalcogenide Sr2ZnCu2(S1-xSex)(2)O-2 compounds were synthesized via solid-state reaction. The Se-substituted samples showed increased electrical conductivity, making them suitable for transparent conductor materials.
MATERIALS RESEARCH EXPRESS
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
I Hase, T. Yanagisawa, H. Kito, K. Iwakiri, T. Nishio, H. Fujihisa, Y. Gotoh, H. Eisaki, K. Kawashima
32ND INTERNATIONAL SYMPOSIUM ON SUPERCONDUCTIVITY (ISS2019)
(2020)
Proceedings Paper
Engineering, Electrical & Electronic
Takashi Yanagisawa
32ND INTERNATIONAL SYMPOSIUM ON SUPERCONDUCTIVITY (ISS2019)
(2020)
Proceedings Paper
Materials Science, Multidisciplinary
Takashi Yanagisawa
31ST INTERNATIONAL SYMPOSIUM ON SUPERCONDUCTIVITY (ISS2018)
(2019)
Proceedings Paper
Materials Science, Multidisciplinary
I. Hase, T. Yanagisawa, A. Iyo, H. Fujihisa, Y. Goto, H. Eisaki, K. Kawashima
31ST INTERNATIONAL SYMPOSIUM ON SUPERCONDUCTIVITY (ISS2018)
(2019)
Article
Physics, Condensed Matter
Takashi Yanagisawa
