Multi-band Superconductivity in the Chevrel Phases SnMo6S8 and PbMo6S8
Abstract
Sub-Kelvin scanning tunnelling spectroscopy in the Chevrel Phases SnMo6S8 and PbMo6S8 reveals two distinct superconducting gaps with Delta1 = 3 meV, Delta2 ~ 1.0 meV and Delta1 = 3.1 meV, Delta2 ~ 1.4 meV respectively. The gap distribution is strongly anisotropic, with Delta2 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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