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Multiband Superconductivity in the Chevrel Phases SnMo6S8 and PbMo6S8

Demuer, A.
Antunes, A.
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Published in Physical Review Letters. 2011, vol. 106, no. 1, p. 017003
Abstract Sub-Kelvin scanning tunneling spectroscopy in the Chevrel phases SnMo6S8 and PbMo6S8 reveals two distinct superconducting gaps with Δ1=3  meV, Δ2∼1.0  meV and Δ1=3.1  meV, Δ2∼1.4  meV, respectively. The gap distribution is strongly anisotropic, with Δ2 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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PETROVIC, Alexander et al. Multiband Superconductivity in the Chevrel Phases SnMo6S8 and PbMo6S8. In: Physical Review Letters, 2011, vol. 106, n° 1, p. 017003. doi: 10.1103/PhysRevLett.106.017003 https://archive-ouverte.unige.ch/unige:23846

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Deposited on : 2012-11-07

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