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Multi-band Superconductivity in the Chevrel Phases SnMo6S8 and PbMo6S8

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arxiv 1006.5956 v1 pith:ORIO4QG5 submitted 2010-06-30 cond-mat.supr-con

Multi-band Superconductivity in the Chevrel Phases SnMo6S8 and PbMo6S8

A.P. Petrovi\'c , R. Lortz , G. Santi , C. Berthod , C. Dubois , M. Decroux , A. Demuer , A.B. Antunes
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A. Par\'e D. Salloum P. Gougeon M. Potel {\O}. Fischer
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classification cond-mat.supr-con
keywords deltaanisotropicchevrelpbmo6s8phasesscanningsnmo6s8across
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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.

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