Multi-band Superconductivity in the Chevrel Phases SnMo6S8 and PbMo6S8

A. P. Petrović; R. Lortz; G. Santi; C. Berthod; C. Dubois; M. Decroux; A. Demuer; A. B. Antunes; A. Paré; D. Salloum; P. Gougeon; M. Potel; Ø. Fischer

doi:10.1103/PhysRevLett.106.017003

Multi-band Superconductivity in the Chevrel Phases SnMo6S8 and PbMo6S8

Superconductivity 2013-03-06 v1

Authors: A. P. Petrović , R. Lortz , G. Santi , C. Berthod , C. Dubois , M. Decroux , A. Demuer , A. B. Antunes , A. Paré , D. Salloum , P. Gougeon , M. Potel , Ø. Fischer

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Abstract

Sub-Kelvin scanning tunnelling spectroscopy in the Chevrel Phases SnMo6S8 and PbMo6S8 reveals two distinct superconducting gaps with Delta_1 = 3 meV, Delta_2 ~ 1.0 meV and Delta_1 = 3.1 meV, Delta_2 ~ 1.4 meV respectively. The gap distribution is strongly anisotropic, with Delta_2 predominantly seen when scanning across unit-cell steps on the (001) sample surface. The spectra are well-fitted by an anisotropic two-band BCS s-wave gap function. Our spectroscopic data are confirmed by electronic heat capacity measurements which also provide evidence for a twin-gap scenario.

Keywords

Chevrel phases multi-band superconductivity scanning tunnelling spectroscopy superconducting gaps BCS s-wave heat capacity

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@article{arxiv.1006.5956,
  title  = {Multi-band Superconductivity in the Chevrel Phases SnMo6S8 and PbMo6S8},
  author = {A. P. Petrović and R. Lortz and G. Santi and C. Berthod and C. Dubois and M. Decroux and A. Demuer and A. B. Antunes and A. Paré and D. Salloum and P. Gougeon and M. Potel and Ø. Fischer},
  journal= {arXiv preprint arXiv:1006.5956},
  year   = {2013}
}

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5 pages, 4 figures

Multi-band Superconductivity in the Chevrel Phases SnMo6S8 and PbMo6S8

Abstract

Keywords

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