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

Shruti; P. Srivastava; S. Patnaik

doi:10.1088/0953-8984/25/31/312202

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

Superconductivity 2015-06-16 v1 Materials Science

Authors: Shruti , P. Srivastava , S. Patnaik

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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 {\Delta}0 was found to be 1.54 meV, corresponding to the ratio 2{\Delta}0/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.

Keywords

superconductivity Bi4O4S3 s-wave symmetry energy gap magnetic penetration depth strong coupling

Cite

@article{arxiv.1305.6913,
  title  = {Evidence for Fully Gapped Strong Coupling S-wave Superconductivity in Bi4O4S3},
  author = {Shruti and P. Srivastava and S. Patnaik},
  journal= {arXiv preprint arXiv:1305.6913},
  year   = {2015}
}

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