122 citations · 650 across the 22 of their papers we have counts for
21 papers · 1 filter
Coexistence of superconductivity and charge-density wave in the quasi-one-dimensional material HfTe3
Saleem J. Denholme, Akinori Yukawa, Kohei Tsumura +6
We present the first experimental evidence for metallicity, superconductivity (SC) and the co-existence of charge density waves (CDW) in the quasi-one-dimensional material HfTe3. T…
Pressure-Induced Superconductivity in BiS2-based EuFBiS2
Kouji Suzuki, Masashi Tanaka, Saleem James Denholme +4
We measured the electrical resistivity of a BiS2-based compound EuFBiS2 under high pressure. Polycrystalline EuFBiS2 shows insulator-metal transition and pressure-induced supercond…
Origin of the Higher-$T_\rm{c}$ Phase in the KFeSe System
Masashi Tanaka, Yusuke Yanagisawa, Masaya Fujioka +7
Single crystals of KFeSe are prepared by quenching at various temperatures. The crystals obtained at higher quenching temperatures have a surface morphology with me…
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…
Site Selectivity on Chalcogen Atoms in Superconducting La(O,F)BiSSe
Masashi Tanaka, Takuma Yamaki, Yoshitaka Matsushita +5
Single crystals of La(O,F)BiSSe were successfully grown by a CsCl flux method. Single crystal X-ray structural analysis revealed that the crystal structure is isostructural with Bi…
Pressure-induced phase transition for single crystalline LaO0.5F0.5BiSe2
Masaya Fujioka, Masashi Tanaka, Saleem J. Denholme +4
We have demonstrated a pressure-induced phase transition from a low-Tc phase to a high-Tc phase in a single crystal of the superconductor LaO0.5F0.5BiSe2. The high-Tc phase appears…
High-Tc Phase of PrO0.5F0.5BiS2 single crystal induced by uniaxial pressure
Masaya Fujioka, Masanori Nagao, Saleem J. Denholme +4
We demonstrated a pressure-induced phase transition from a low-Tc phase (3.5 K) to a high-Tc phase (8.7 K) in single crystalline PrO0.5F0.5BiS2. The high-Tc phase is easily observe…
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…
First single crystal growth and structural analysis of superconducting layered bismuth oxyselenide; La(O,F)BiSe2
Masashi Tanaka, Masanori Nagao, Yoshitaka Matsushita +5
Single crystal of La(O,F)BiSe2 was successfully grown for the first time by the CsCl flux method. Single crystal X-ray structural analysis clearly showed that La(O,F)BiSe2 crystali…
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…
The effect of exceptionally high fluorine doping on the anisotropy of single crystalline SmFeAsO1-xFx
Masaya Fujioka, Saleem J. Denholme, Masashi Tanaka +3
We succeeded in growing single crystalline SmFeAsO1-xFx with exceptionally high fluorine concentration by using a CsCl flux method. Comparing to conventional flux methods, this met…
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…
Sulfur annealing effect for superconductivity in iron chalcogenide compounds
K. Deguchi, A. Yamashita, T. Yamaki +8
We discovered a novel annealing method for Fe-chalcogenide superconductors. It was found that sulfur annealing deintercalated excess Fe via formation of FeS2. Due to its specifics,…
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…
α-FeAs-free SmFeAsO1-xFx by low temperature sintering with slow cooling
Masaya Fujioka, Saleem James Denholme, Toshinori Ozaki +9
We obtained amorphous-FeAs-free SmFeAsO1-xFx using a low temperature sintering with slow cooling. SmFeAsO1-xFx is sintered at 980 °C for 40 hours and cooled slowly down to 600 °C.…
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…
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…