Evidence for Fully Gapped Strong Coupling S-wave Superconductivity in Bi4O4S3

Abstract

We report on the superconducting gap and pairing symmetry in layered superconductor Bi4O4S3. The measurement of temperature dependence of magnetic penetration depth was carried out using tunnel diode oscillator technique. It is observed that Bi4O4S3 is a conventional s-wave type superconductor with fully developed gap. The zero-temperature value of the superconducting energy gap Δ0 was found to be 1.54 meV, corresponding to the ratio 2Δ0/kBTc=7.2 which is much higher than the BCS value of 3.53. In the superconducting range, superfluid density is very well described by single gap s- wave model.

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• Material Development and Physical Properties of BiS2-Based Layered Compounds
• Unexpected Giant Superconducting Fluctuation and Anomalous Semiconducting Normal State in NdO1-xFxBi1-yS2 Single Crystals
• Electronic Structure of Single Crystalline NdO${}_{0.5}$F${}_{0.5}$BiS${}_2$ Studied by Angle-resolved Photoemission Spectroscopy
• s-wave pairing in the optimally-doped LaO0.5F0.5BiS2 superconductor
• Checkerboard stripe electronic state on cleaved surface of NdO${}_{0.7}$F${}_{0.3}$BiS${}_2$ probed by scanning tunneling microscope
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• Superconductivity of Electron-Doped NdOBiS2 by Substitution of Mixed-Valence Ce ions
• Impurity Effects in Nodal Extended $s$- and Nodeless $d$-Wave Superconductors: Gap Symmetry of BiS${}_2$-Based Layered Superconductors