Material Development and Physical Properties of BiS2-Based Layered Compounds

Y Mizuguchi - Journal of the Physical Society of Japan, 2019‏ - journals.jps.jp
In 2012, we discovered superconductivity in Bi4O4S3 and LaO1− x F x BiS2, whose crystal
structures are composed of alternate stacks of a BiS2-type conduction layer and a blocking …

Electronic Structure and Superconducting Gap Structure in BiS2-based Layered Superconductors

K Suzuki, H Usui, K Kuroki, T Nomoto… - Journal of the Physical …, 2019‏ - journals.jps.jp
BiS2-based layered superconductors have attracted considerable interest owing to the
relatively large spin–orbit coupling of bismuth 6 p orbitals, the strong coupling nature by …

Bose-Einstein condensation superconductivity induced by disappearance of the nematic state

T Hashimoto, Y Ota, A Tsuzuki, T Nagashima… - Science …, 2020‏ - science.org
The crossover from the superconductivity of the Bardeen-Cooper-Schrieffer (BCS) regime to
the Bose-Einstein condensation (BEC) regime holds a key to understanding the nature of …

Superconducting gap anisotropy sensitive to nematic domains in FeSe

T Hashimoto, Y Ota, HQ Yamamoto, Y Suzuki… - Nature …, 2018‏ - nature.com
The structure of the superconducting gap in unconventional superconductors holds a key to
understand the momentum-dependent pairing interactions. In superconducting FeSe, there …

Superconducting pairing of topological surface states in bismuth selenide films on niobium

D Flötotto, Y Ota, Y Bai, C Zhang, K Okazaki… - Science …, 2018‏ - science.org
A topological insulator film coupled to a simple isotropic s-wave superconductor substrate
can foster helical pairing of the Dirac fermions associated with the topological surface states …

Selenium isotope effect in the layered bismuth chalcogenide superconductor

K Hoshi, Y Goto, Y Mizuguchi - Physical Review B, 2018‏ - APS
We have investigated the Se isotope effect in the layered bismuth chalcogenide (BiC h 2-
based) superconductor La O 0.6 F 0.4 Bi (S, Se) 2 with Se 76 and Se 80. For all examined …

Evolution of Anisotropic Displacement Parameters and Superconductivity with Chemical Pressure in BiS2-Based REO0.5F0.5BiS2 (RE = La, Ce, Pr, and Nd)

Y Mizuguchi, K Hoshi, Y Goto, A Miura… - Journal of the Physical …, 2018‏ - journals.jps.jp
In order to understand the mechanisms behind the emergence of superconductivity by the
chemical pressure effect in REO0. 5F0. 5BiS2 (RE= La, Ce, Pr, and Nd), where bulk …

Extremely high upper critical field in BiCh2-based (Ch: S and Se) layered superconductor LaO0.5F0.5BiS2−xSex (x = 0.22 and 0.69)

K Hoshi, R Kurihara, Y Goto, M Tokunaga… - Scientific reports, 2022‏ - nature.com
Centrosymmetric compounds with local inversion symmetry breaking have tremendously
interesting and intriguing physical properties. In this study, we focus on a BiCh2-based (Ch …

SnAs-Based Layered Superconductor NaSn2As2

Y Goto, A Yamada, TD Matsuda, Y Aoki… - Journal of the Physical …, 2017‏ - journals.jps.jp
Superconducting behavior with exotic characteristics is often observed in materials with a
layered two-dimensional crystal structure. Low dimensionality affects the electronic structure …

Superconducting gap symmetry of the -based superconductor elucidated through specific heat measurements

N Kase, Y Terui, T Nakano, N Takeda - Physical Review B, 2017‏ - APS
In this study, the superconducting gap symmetry of LaO 0.5 F 0.5 BiSSe is elucidated
through specific heat measurements with one single crystal of LaO 0.5 F 0.5 BiSSe. A clear …