119 citations · 497 across the 13 of their papers we have counts for
13 papers
GP-Adapter: Gaussian Process CLIP-Adapter for Few-Shot Out-of-Distribution Detection
Taisei Saito, Koretaka Ogata, Takafumi Hiroi
We propose GP-Adapter, a training-free framework that augments CLIP (Contrastive Language-Image Pre-training) with Gaussian Process (GP) uncertainty modeling for few-shot classific…
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…
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…
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…
Increase in Tc and change of crystal structure by high-pressure annealing in BiS2-based superconductor CeO0.3F0.7BiS2
Joe Kajitani, Takafumi Hiroi, Atsushi Omachi +2
Recently, several types of BiS2-based superconductor such as Bi4O4S3, REO1-xFxBiS2 (RE: rare earth) and Sr1-xLaxFBiS2 have been discovered. In this study, we have investigated the…
Element Substitution Effect on Superconductivity in BiS2-Based NdO_{1-x}F_xBiS_2
Takafumi Hiroi, Joe Kajitani, Atsushi Omachi +2
Recently, new layered superconductors having a BiS2-type conduction layer have been discovered. NdO1-xFxBiS2 is a typical BiS2-based superconductor with a maximum Tc of 5.4 K. In t…
Stabilization of high-Tc phase of BiS2-based superconductor LaO0.5F0.5BiS2 using high-pressure synthesis
Yoshikazu Mizuguchi, Takafumi Hiroi, Joe Kajitani +3
High-quality polycrystalline samples of LaO0.5F0.5BiS2 were obtained using high-pressure synthesis technique. The LaO0.5F0.5BiS2 sample prepared by heating at 700 C under 2 GPa sho…
Enhancement of Tc by uniaxial lattice contraction in BiS2-based superconductor PrO0.5F0.5BiS2
Joe Kajitani, Keita Deguchi, Takafumi Hiroi +5
We investigated the crystal structure and superconducting properties of As-grown and high-pressure-annealed PrO0.5F0.5BiS2. We found that the high-pressure annealing generates unia…
High-temperature thermoelectric properties of novel layered bismuth-sulfide LaO1-xFxBiS2
Atsushi Omachi, Joe Kajitani, Takafumi Hiroi +2
We have investigated the high-temperature thermoelectric properties of the layered compound LaO1-xFxBiS2. The electrical resistivity of LaOBiS2 showed an anomalous behavior; a meta…
Chemical pressure effect on Tc in BiS2-based Ce1-xNdxO0.5F0.5BiS2
Joe Kajitani, Atsushi Omachi, Takafumi Hiroi +2
We have investigated the crystal structure and superconducting properties of the BiS2-based layered superconductor Ce1-xNdxO0.5F0.5BiS2. Bulk superconductivity was observed for x >…
Correlation between crystal structure and superconductivity in LaO0.5F0.5BiS2
Joe Kajitani, Keita Deguchi, Atsushi Omachi +6
Correlation between crystal structure and superconducting properties of the BiS2-based superconductor LaO0.5F0.5BiS2 was investigated. We have prepared LaO0.5F0.5BiS2 polycrystalli…