421 citations · 2.6k across the 49 of their papers we have counts for
49 papers
Influence of trapped magnetic field of Sn-Pb solders on electrical resistivity measurement: an example of superconducting transition of Sn
Takumi Ichikawa, Yuto Watanabe, Takumi Murakami +3
We examined the affection of the flux-trapped states of Sn60-Pb40 solders on superconducting properties of a Sn wire. The temperature dependence of electrical resistivity at H = 0…
Tuning of Carrier Concentration and Superconductivity in High-Entropy-Alloy-Type Metal Telluride (AgSnPbBi)(1-x)/4InxTe
Md. Riad Kasem, Ryota Ishii, Takayoshi Katase +2
High-entropy-alloy-type (HEA-type) compound superconductors have been drawing much attention as a new class of exotic superconductors with local structural inhomogeneity. NaCl-type…
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…
Synthesis, Crystal Structure, and Physical Properties of New Layered Oxychalcogenide La2O2Bi3AgS6
Yudai Hijikata, Tomohiro Abe, Chikako Moriyoshi +7
We have synthesized a new layered oxychalcogenide La2O2Bi3AgS6. From synchrotron X-ray diffraction and Rietveld refinement, the crystal structure of La2O2Bi3AgS6 was refined using…
Intrinsic Phase Diagram of Superconductivity in the BiCh2-based System Without In-plane Disorder
Kouhei Nagasaka, Atsuhiro Nishida, Rajveer Jha +11
We have investigated the crystal structure and physical properties of LaO1-xFxBiSSe to reveal the intrinsic superconductivity phase diagram of the BiCh2-based layered compound fami…
Bi Substitution Effects on Superconductivity of Valence-Skip superconductor AgSnSe2
Yudai Hijikata, Atsuhiro Nishida, Kohei Nagasaka +5
We have synthesized AgSn1-xBixSe2 polycrystalline samples to investigate the effect of partial substitution of mixed-valence Sn by Bi3+ to the superconductivity of the valence-skip…
Synchrotron powder X-ray diffraction and structural analysis of Eu0.5La0.5FBiS2-xSex
K. Nagasaka, G. Jinno, O. Miura +4
Eu0.5La0.5FBiS2-xSex is a new BiS2-based superconductor system. In Eu0.5La0.5FBiS2-xSex, electron carriers are doped to the BiS2 layer by the substitution of Eu by La. Bulk superco…
Bulk Superconductivity Induced by In-plane Chemical Pressure Effect in Eu0.5La0.5FBiS2-xSex
Gen Jinno, Rajveer Jha, Akira Yamada +6
We have investigated Se substitution effect to superconductivity of an optimally-doped BiS2-based superconductor Eu0.5La0.5FBiS2. Eu0.5La0.5FBiS2-xSex samples with x = 0-1 were syn…
Specific Heat and Electrical Transport Properties of Sn0.8Ag0.2Te Superconductor
Yoshikazu Mizuguchi, Akira Yamada, Ryuji Higashinaka +4
Sn0.8Ag0.2Te is a new superconductor with Tc ~ 2.4 K. The superconducting properties of Sn0.8Ag0.2Te have been investigated by specific heat measurements under magnetic fields. Bul…
Compositional and temperature evolution of crystal structure of new thermoelectric compound LaOBiS2-xSex
Y. Mizuguchi, A. Miura, A. Nishida +7
We examined the crystal structure of the new thermoelectric material LaOBiS2-xSex, whose thermoelectric performance is enhanced by Se substitution, by using powder synchrotron X-ra…
Crystal structure instability of FeSe grains: Formation of non-superconducting phase at the grain surface
Hiroki Izawa, Yuji Tanaka, Yoshikazu Mizuguchi +1
We investigated the magnetization and crystal structure of FeSe polycrystalline samples with various grain sizes. For the samples with large grains, a large magnetic critical curre…
High-Pressure Synthesis and Superconductivity of Ag-doped Topological Crystalline Insulator SnTe (Sn1-xAgxTe with x = 0-0.5)
Yoshikazu Mizuguchi, Osuke Miura
We have synthesized the single-phase polycrystalline samples of Sn1-xAgxTe, Ag-doped topological crystalline insulator SnTe, with a range of x = 0-0.5 using a high-pressure synthes…
Thermoelectric properties of new Bi-chalcogenide layered compounds
Yoshikazu Mizuguchi, Atsuhiro Nishida, Atsushi Omachi +1
The layered Bi-chalcogenide compounds have been drawing much attention as a new layered superconductor family since 2012. Due to the rich variation of crystal structure and constit…
Electronic Origins of Large Thermoelectric Power Factor of LaOBiS2-xSex
Atsuhiro Nishida, Hirotaka Nishiate, Chul-Ho Lee +2
We examined the electrical transport properties of densified LaOBiS2-xSex, which constitutes a new family of thermoelectric materials. The power factor increased with increasing co…
Superconductivity phase diagram of Se-substituted CeO0.5F0.5Bi(S1-xSex)2
Yoshikazu Mizuguchi, Takafumi Hiroi, Osuke Miura
We investigated the effects of Se substitution on the lattice constants and superconducting properties of CeO0.5F0.5Bi(S1-xSex)2. With increasing Se concentration, the a lattice co…
High thermoelectric performance and low thermal conductivity of densified LaOBiSSe
Atsuhiro Nishida, Osuke Miura, Chul-Ho Lee +1
In this study, we examined the thermoelectric properties of the layered bismuth-chalcogenide-based (BiCh2-based) compound LaOBiSSe, which is expected to be a new candidate material…
Pronounced - Log T Divergence in Specific Heat of Nonmetallic CeOBiS: A Mother Phase of BiS-Based Superconductor
Ryuji Higashinaka, Takuya Asano, Takuya Nakashima +5
The low-temperature properties of CeOBiS single crystals are studied by electrical resistivity, magnetization, and specific heat measurements. Ce 4f -electrons are found to be…
In-plane chemical pressure essential for superconductivity in BiCh2-based (Ch: S, Se) layered structure
Yoshikazu Mizuguchi, Akira Miura, Joe Kajitani +7
BiCh2-based superconductors (Ch: S, Se) are a new series of layered superconductor. However, mechanisms for the emergence of superconductivity in BiCh2-based superconductors have n…
In-plane Charge Fluctuations in Bismuth Sulfide Superconductors
Anushika Athauda, Junjie Yang, Seunghun Lee +5
Evidence for local charge fluctuations linked to a charge disproportionation of the Bi ions in the distorted lattice of superconducting LaOF BiS is presented. I…
Proximity to Fermi-surface topological change in superconducting LaO0.54F0.46BiS2
K. Terashima, J. Sonoyama, T. Wakita +16
The electronic structure of nearly optimally-doped novel superconductor LaOFBiS ( = 0.46) was investigated using angle-resolved photoemission spectroscopy…
Coexistence of ferromagnetism and superconductivity in CeOFBiS
J. Lee, S. Demura, M. B. Stone +10
Bulk magnetization, transport and neutron scattering measurements were performed to investigate the electronic and magnetic properties of a polycrystalline sample of the newly disc…
Evolution of superconductivity in BiS2-based superocnductor LaO0.5F0.5Bi(S1-xSex)2
Takafumi Hiroi, Joe Kajitani, Atsushi Omachi +2
We have systematically investigated the crystal structure, magnetic susceptibility, and electrical resistivity of the BiS2-based superconductor LaO0.5F0.5Bi(S1-xSex)2 (x = 0 - 0.7)…
Enhancement of thermoelectric properties by Se substitution in layered bismuth-chalcogenide LaOBiS2-xSex
Yoshikazu Mizuguchi, Atsushi Omachi, Yosuke Goto +5
We have investigated the thermoelectric properties of the novel layered bismuth chalcogenides LaOBiS2-xSex. The partial substitution of S by Se produced the enhancement of electric…
Chemical pressure effect on superconductivity of BiS2-based Ce1-xNdxO1-yFyBiS2 and Nd1-zSmzO1-yFyBiS2
Joe Kajitani, Takafumi Hiroi, Atsushi Omachi +2
We have systematically investigated the crystal structure and the magnetic properties of BiS2-based superconductor Ce1-xNdxO1-yFyBiS2 (x = 0 - 1.0, y = 0.3, 0.5 and 0.7) and Nd1-zS…