122 citations · 722 across the 30 of their papers we have counts for
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Origin of Pressure-induced Superconducting Phase in KFeSe studied by Synchrotron X-ray Diffraction and Spectroscopy
Yoshiya Yamamoto, Hitoshi Yamaoka, Masashi Tanaka +12
Pressure dependence of the electronic and crystal structures of KFeSe, which has pressure-induced two superconducting domes of SC I and SC II, was investigated…
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…
Electrochemical deposition of FeSe on RABiTS tapes
Satoshi Demura, Masashi Tanaka, Aichi Yamashita +9
FeSe film is successfully fabricated onto Rolling Assisted Biaxially Textured Substrate (RABiTS) tapes by an electrochemical deposition technique. The deposited FeSe films tend to…
Superconductivity in FeTe{1-x}S_x induced by electrochemical reaction using ionic liquid solution
Aichi Yamashita, Satoshi Demura, Masashi Tanaka +11
Superconductivity in FeTe0.8S0.2 is successfully induced by an electrochemical reaction using an ionic liquid solution. A clear correlation between the Fe concentration in the solu…
Superconductivity in FeTe0.8S0.2 induced by battery-like reaction
Aichi Yamashita, Satoshi Demura, Masashi Tanaka +11
Superconductivity is successfully induced by utilizing a battery-like reaction found in a typical Li-ion battery. Excess Fe in FeTe0.8S0.2 is electrochemically de-intercalated by a…
Soft x-ray photoemission study of new BiS-layered superconductor LaOFBiS
Shinsuke Nagira, Junki Sonoyama, Takanori Wakita +16
We use core level and valence band soft x-ray photoemission spectroscopy (SXPES) to investigate electronic structure of new BiS layered superconductor LaOFBiS$_…
Coexistence of bulk superconductivity and ferromagnetism in CeO1-xFxBiS2
Satoshi Demura, Keita Deguchi, Yoshikazu Mizuguchi +14
We show the observation of the coexistence of bulk superconductivity and ferromagnetism in CeO1-xFxBiS2(x = 0 - 1.0) prepared by annealing under high-pressure. In CeO1-xFxBiS2 syst…
Phase diagram and superconductivity at 58.1 K in α-FeAs free SmFeAsO1-xFx
Masaya Fujioka, Saleem James Denholme, Toshinori Ozaki +9
The Phase diagram of SmFeAsO1-xFx in terms of x is exhibited in this study. SmFeAsO1-xFx from x = 0 to x = 0.3 were prepared by low temperature sintering with slow cooling. The low…
Superconductivity in Fe1+dTe0.9Se0.1 induced by deintercalation of excess Fe using alcoholic beverage treatment
K. Deguchi, S. Demura, H. Hara +8
Superconductivity in polycrystalline Fe1+dTe0.9Se0.1 was enhanced by heating in alcoholic beverages. We found that part of the excess Fe was deintercalated from the interlayer site…
Evolution of superconductivity in LaO1-xFxBiS2 prepared by high pressure technique
K. Deguchi, Y. Mizuguchi, S. Demura +10
Novel BiS2-based superconductors LaO1-xFxBiS2 prepared by the high pressure synthesis technique were systematically studied. It was found that the high pressure annealing strongly…
Evolution of superconductivity in isovalent Te-substituted KxFe2-ySe2 crystals
Toshinori Ozaki, Hiroyuki Takeya, Keita Deguchi +8
We report the evolution of superconductivity and the phase diagram of the KxFe2-ySe2-zTez (z=0-0.6) crystals grown by a simple one-step synthesis. No structural transition is obser…
Fermiological Interpretation of Superconductivity/Non-superconductivity of FeTe_{1-x}Se_{x} Thin Crystal Determined by Quantum Oscillation Measurement
H. Okazaki, T. Watanabe, T. Yamaguchi +8
We have successfully observed quantum oscillation (QO) for FeTe_{1-x}Se_{x}. QO measurements were performed using non-superconducting and superconducting thin crystals of FeTe_{0.6…
BiS2 - based superconductivity in F-substituted NdOBiS2
Satoshi Demura, Yoshikazu Mizuguchi, Keita Deguchi +12
We have successfully synthesized a new BiS2-based superconductor NdOBiS2 with F-doping. This compound is composed of superconducting BiS2 layers and blocking NdO layers, which indi…
Electrodeposition as a new route to synthesize superconducting FeSe
Satoshi Demura, Hiroyuki Okazaki, Toshinori Ozaki +9
We have successfully synthesized FeSe films by the electrochemical deposition in the electrolyte containing FeCl_{2}\cdot4H_{2}O, SeO_{2} and Na_{2}SO_{4}. The composition ratio of…
Evidence of Inhomogeneous Superconductivity in FeTeSe Thin Film Using Scotch-Tape Method
H. Okazaki, T. Watanabe, T. Yamaguchi +8
We have fabricated thin films of FeTeSe using a scotch-tape method. The superconductivities of the thin films are different from each other although these films were fa…
Clarification as to why alcoholic beverages have the ability to induce superconductivity in Fe_{1+d}Te_{1-x}S_x
K. Deguchi, D. Sato, M. Sugimoto +12
To elucidate the mechanism as to why alcoholic beverages can induce superconductivity in Fe_{1+d}Te_{1-x}S_x samples, we performed component analysis and found that weak acid such…
Tartaric acid in red wine as one of the key factors to induce superconductivity in FeTe0.8S0.2
Keita Deguchi, Tohru Okuda, Yasuna Kawasaki +10
The red wine dependence of superconductivity in FeTe0.8S0.2 was investigated. Samples with a higher shielding volume fraction had a tendency to show a higher concentration of tarta…
One-step synthesis of KxFe2-ySe2 single crystals for high critical current density
Toshinori Ozaki, Hiroyuki Takeya, Hiroyuki Okazaki +7
We have established a simple process that allows for the one-step synthesis of KxFe2-ySe2 single crystals, which exhibit high critical current density Jc. The post annealing and qu…
Enhancement of superconducting properties in FeSe wires using a quenching technique
Toshinori Ozaki, Yoshikazu Mizuguchi, Satoshi Demura +9
Enhancements of superconducting properties were observed in FeSe wires using a quenching technique. Zero resistivity was achieved at about 10 K in quenched wires, which is about 2…
Electrochemical synthesis of iron-based superconductor FeSe films
Satoshi Demura, Toshinori Ozaki, Hiroyuki Okazaki +8
The superconducting FeSe films were successfully fabricated using the electrochemical synthesis. The composition ratio of Fe and Se can be controlled by the electric potential and…
Phase diagram and oxygen annealing effect of FeTe1-xSex iron-based superconductor
Y. Kawasaki, K. Deguchi, S. Demura +6
Phase diagrams of as-grown and O2-annealed FeTe1-xSex determined from magnetic susceptibility measurement were obtained. For as-grown samples, the antiferromagnetic order was fully…
Preparation of Thin Crystals of FeTe1-xSx Using the Scotch-Tape Method
Yoshikazu Mizuguchi, Tohru Watanabe, Hiroyuki Okazaki +3
We have investigated an applicability of the scotch-tape method to fabricating thin crystals of Fe chalcogenide FeTe1-xSx. Thin crystals with a typical thickness of 40 nm were expe…
Electronic Structure of Superconducting FeSe Studied by High-Resolution Photoemission Spectroscopy
Rikiya Yoshida, Takanori Wakita, Hiroyuki Okazaki +13
We have performed soft x-ray and ultrahigh-resolution laser-excited photoemission measurements on tetragonal FeSe, which was recently identified as a superconductor. Energy depende…
Electronic Structure of Noncentrosymmetric Superconductor Li(PdPt3)B Studied by Photoemission Spectroscopy
Rikiya Yoshida, Hiroyuki Okazaki, Mitsutoshi Tajima +8
We have performed x-ray photoemission spectroscopy on the system of noncentrosymmetric superconductor, Li(PdPt3)B. For LiPtB, we found 2 major peaks with 2…