92 citations · 851 across the 51 of their papers we have counts for
51 papers
Glassy atomic vibrations and blurry electronic structures created by local structural disorders in high-entropy metal telluride superconductors
Yoshikazu Mizuguchi, Hidetomo Usui, Rei Kurita +10
The motivation of this work is our recent observation of the robustness of superconductivity in a High-entropy (HE) superconductor Ag0.2In0.2Sn0.2Pb0.2Bi0.2Te (CsCl-type) to extern…
Lattice Anharmonicity in BiS2-Based Layered Superconductor RE(O,F)BiS2 (RE = La, Ce, Pr, Nd)
Fysol Ibna Abbas, Kazuhisa Hoshi, Aichi Yamashita +9
We studied Grüneisen parameter (γG) to investigate lattice anharmonicity in a layered BiS2-based superconductor system REO1-xFxBiS2 (RE = La, Ce, Pr, Nd), where in-plane chemical p…
The upper critical field in the BiCh2-based superconductors CeOBiS1.7Se0.3 and PrO0.5F0.5BiS2-xSex (x = 0, 0.3)
Ryosuke Kiyama, Kazuhisa Hoshi, Yosuke Goto +2
We report the upper critical field (Bc2) in the BiCh2-based superconductors CeOBiS1.7Se0.3 and PrO0.5F0.5BiS2-xSex (x = 0, 0.3). Single crystals of CeOBiS1.7Se0.3 and PrO0.5F0.5BiS…
Robustness of superconductivity to external pressure in high-entropy-alloy-type metal telluride AgInSnPbBiTe5
Md. Riad Kasem, Yuki Nakahira, Hitoshi Yamaoka +7
High-entropy-alloy (HEA) superconductors are a new class of disordered superconductors. In this study, we investigate the robustness of superconducting states in HEA-type metal tel…
Improvement of upper critical field by the compositionally-complex-alloy concept in A15 superconductor V3X (X: Al, Si, Ga, Ge, Sn)
Yuki Nakahira, Ryosuke Kiyama, Aichi Yamashita +5
Compositionally complex alloys (CCAs) are a new category of high-entropy materials containing more than two high-entropy phases in an alloy sample. We applied the concept of CCA to…
Extremely high upper critical field in BiCh-based (Ch: S and Se) layered superconductor LaOFBiSSe ( = 0.22 and 0.69)
Kazuhisa Hoshi, Ryosuke Kurihara, Yosuke Goto +2
Centrosymmetric compounds with local inversion symmetry breaking have tremendously interesting and intriguing physical properties. In this study, we focus on a BiCh-based (Ch:…
Superconductivity in In-doped AgSnBiTe3 with possible band inversion
Tsubasa Mitobe, Kazuhisa Hoshi, Md. Riad Kasem +9
We investigated the chemical pressure effects on structural and electronic properties of SnTe-based material using partial substitution of Sn by Ag0.5Bi0.5, which results in lattic…
Axis-dependent carrier polarity in polycrystalline NaSnAs
Naoto Nakamura, Yosuke Goto, Yoshikazu Mizuguchi
Transverse thermoelectric devices consist of only one thermoelectric material, unlike conventional longitudinal thermoelectric devices that require two types of thermoelectric mate…
Anomalous broadening of specific heat jump at Tc in high-entropy-alloy-type superconductor TrZr2
Md. Riad Kasem, Aichi Yamashita, Taishi Hatano +3
A high-entropy-alloy-type (HEA-type) superconductor is new category of highly disordered superconductors. Therefore, finding brand-new superconducting characteristics in the HEA-ty…
High-pressure effects on superconducting properties and crystal structure of Bi-based layered superconductor La2O2Bi3Ag0.6Sn0.4S6
Supeng Liu, Ryo Matsumoto, Rajveer Jha +5
The effects of pressure on the superconducting properties of a Bi-based layered superconductor La2O2Bi3Ag0.6Sn0.4S6, which possesses a four-layer-type conducting layer, have been s…
Investigation of superconducting properties and possible nematic superconductivity in self-doped BiCh2-based superconductor CeOBiS1.7Se0.3
Ryosuke Kiyama, Kazuhisa Hoshi, Yosuke Goto +1
We investigate the superconducting properties and possible nematic superconductivity of self-doped BiCh2-based (Ch: S, Se) superconductor CeOBiS1.7Se0.3 through the measurements of…
Synthesis of high-entropy-alloy-type superconductors (Fe,Co,Ni,Rh,Ir)Zr2 with tunable transition temperature
Md. Riad Kasem, Aichi Yamashita, Yosuke Goto +2
We report on the synthesis and superconductivity of high-entropy-alloy-type (HEA-type) compounds TrZr2 (Tr = Fe, Co, Ni, Rh, Ir), in which the Tr site satisfies the criterion of HE…
Observing and modeling the sequential pairwise reactions that drive solid-state ceramic synthesis
Akira Miura, Christopher J. Bartel, Yusuke Goto +11
Solid-state synthesis from powder precursors is the primary processing route to advanced multicomponent ceramic materials. Designing ceramic synthesis routes is usually a laborious…
Structural phase diagram of LaO1-xFxBiSSe: suppression of the structural phase transition by partial F substitutions
Kazuhisa Hoshi, Shunsuke Sakuragi, Takeshi Yajima +5
We have investigated low-temperature crystal structure of BiCh2-based compounds LaO1-xFxBiSSe (x = 0, 0.01, 0.02, 0.03, and 0.5), in which anomalous two-fold-symmetric in-plane ani…
Multigap superconductivity in the new BiCh-based layered superconductor LaCeOBiSSe
A. Bhattacharyya, D. T. Adroja, R. Sogabe +3
The layered bismuth oxy-sulfide materials, which are structurally related to the Fe-pnictides/chalcogenides and cuprates superconductors, have brought substantial attention for und…
Investigation of in-plane anisotropy of c-axis magnetoresistance for BiCh2-based layered superconductor NdO0.7F0.3BiS2
Kazuhisa Hoshi, Kenta Sudo, Yosuke Goto +2
We have investigated the in-plane anisotropy of the c-axis magnetoresistance (MR) in both superconducting and normal states of single crystals of NdO0.7F0.3BiS2 under in-plane magn…
Possible pairing mechanism switching driven by structural symmetry breaking in BiS2-based layered superconductors
Aichi Yamashita, Hidetomo Usui, Kazuhisa Hoshi +3
Investigation of isotope effects on superconducting transition temperature (Tc) is one of the useful methods to examine whether electron-phonon interaction is essential for pairing…
Two-fold symmetry of in-plane magnetoresistance anisotropy in the superconducting states of BiCh2-based LaO0.9F0.1BiSSe single crystal
Kazuhisa Hoshi, Motoi Kimata, Yosuke Goto +5
Recently, two-fold symmetric in-plane anisotropy of the superconducting properties have been observed in a single crystal of BiCh2-based (Ch: S, Se) layered superconductor LaO0.5F0…
Evolution of two bulk-superconducting phases in Sr0.5RE0.5FBiS2 (RE: La, Ce, Pr, Nd, Sm) by external hydrostatic pressure effect
Aichi Yamashita, Rajveer Jha, Yosuke Goto +7
Polycrystalline samples of Sr1-xRExFBiS2 (RE: La, Ce, Pr, Nd, and Sm) were synthesized via the solid-state reaction and characterized using synchrotron X-ray diffraction. Although…
Crystal Structure and Thermoelectric Transport Properties of As-Doped Layered Pnictogen Oxyselenides NdO0.8F0.2Sb1-xAsxSe2
Kota Morino, Yosuke Goto, Akira Miura +3
We report the synthesis and thermoelectric transport properties of As-doped layered pnictogen oxyselenides NdO0.8F0.2Sb1-xAsxSe2 (x < 0.7), which are predicted to show high-perform…
Synthesis of RE123 high-Tc superconductors with a high-entropy-alloy-type RE site
Yuta Shukunami, Aichi Yamashita, Yosuke Goto +1
We have synthesized high-entropy-alloy-type (HEA-type) RE123 superconductors Y0.28Nd0.16Sm0.18Eu0.18Gd0.20Ba2Cu3O7-d and Y0.18La0.24Nd0.14Sm0.14Eu0.15Gd0.15Ba2Cu3O7-d with a superc…
Bulk superconductivity induced by Se substitution in self-doped BiCh2-based compound CeOBiS2-xSex
Ryosuke Kiyama, Yosuke Goto, Kazuhisa Hoshi +7
We report the Se substitution effects on the crystal structure, superconducting properties, and valence states of self-doped BiCh2-based compound CeOBiS2-xSex. Polycrystalline CeOB…
Superconducting properties of high-entropy-alloy tellurides M-Te (M: Ag, In, Cd, Sn, Sb, Pb, Bi) with a NaCl-type structure
Md. Riad Kasem, Kazuhisa Hoshi, Rajveer Jha +6
High-entropy-alloy-type tellurides M-Te, which contain five different metals of M = Ag, In, Cd, Sn, Sb, Pb, and Bi, were synthesized using high pressure synthesis. Structural chara…
Superconductivity in Se-doped La2O2Bi2Pb2S6-xSex with a Bi2Pb2Ch4-type thick conducting layer
Rajveer Jha, Yosuke Goto, Tatsuma D. Matsuda +2
La2O2Bi2Pb2S6 is a layered Bi-based oxychalcogenide with a thick four-layer-type conducting layer. Although La2O2Bi2Pb2S6 is a structural analogue of La2O2Bi3AgS6, which is a super…