Multiband superconductivity in the Chevrel phases SnMo6S8 and PbMo6S8. - Université de Rennes Accéder directement au contenu
Article Dans Une Revue Physical Review Letters Année : 2011

Multiband superconductivity in the Chevrel phases SnMo6S8 and PbMo6S8.

Résumé

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.

Domaines

Matériaux
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Dates et versions

hal-00822338 , version 1 (14-05-2013)

Identifiants

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A. P. Petrović, R. Lortz, G. Santi, Carole Berthod, C. Dubois, et al.. Multiband superconductivity in the Chevrel phases SnMo6S8 and PbMo6S8.. Physical Review Letters, 2011, 106 (1), pp.017003. ⟨10.1103/PhysRevLett.106.017003⟩. ⟨hal-00822338⟩
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