Superconducting gap symmetry of the BiS${}_2$-based superconductor LaO${}_{0.5}$F${}_{0.5}$BiSSe elucidated through specific heat measurement

Abstract

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 jump is observed at 3.95 K in LaO${}_{0.5}$F${}_{0.5}$BiSSe, suggesting bulk superconductivity. From specific heat measurements, $\Delta C_{\mathrm{e}}/\gamma T_{\mathrm{c}}$ and 2$\Delta$(0)/$k_{\mathrm{B}}{T}_{\mathrm{c}}$ are obtained as 2.31 and 4.5. These values indicate strong electron-phonon coupling superconductivity. The temperature ($T$) and magnetic-field ($H$) dependence of the electronic specific heat $C_{\mathrm{e}}(T,H)$ suggests that superconductivity is fully gapped. Our handmade system successfully elucidates superconducting gap symmetry of the BiS${}_2$-based compound with a small single crystal.

arXiv comment5 pages, 4 figures

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• Material Development and Physical Properties of BiS2-Based Layered Compounds
• Superconductivity and Local Inversion-Symmetry Breaking
• Anisotropic two-gap superconductivity and the absence of a Pauli paramagnetic limit in single-crystalline LaO${}_{0.5}$F${}_{0.5}$BiS${}_2$
• Two-Fold-Symmetric Magnetoresistance in Single Crystals of Tetragonal BiCh2-Based Superconductor LaO0.5F0.5BiSSe
• Structural phase diagram of LaO1-xFxBiSSe: suppression of the structural phase transition by partial F substitutions
• Superconductivity of Electron-Doped NdOBiS2 by Substitution of Mixed-Valence Ce ions
• Effects of equivalent composition on superconducting properties of high-entropy REOBiS${}_2$ (RE = La, Ce, Pr, Nd, Sm, Gd) single crystals
• Pressure tuning of localization and superconductivity in LaOPbBiS${}_3$ and La${}_2$O${}_2$Bi${}_3$AgS${}_6$
• Extremely high upper critical field in BiCh${}_2$-based (Ch: S and Se) layered superconductor LaO${}_{0.5}$F${}_{0.5}$BiS${}_{2-x}$Se${}_x$ ($x$ = 0.22 and 0.69)
• The upper critical field in the BiCh2-based superconductors CeOBiS1.7Se0.3 and PrO0.5F0.5BiS2-xSex (x = 0, 0.3)