title: Multiband superconductivity in the Chevrel phases SnMo6S8 and PbMo6S8.
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.
authors.affiliation: DPMC-MaNEP, Université de Genève, Quai Ernest-Ansermet 24, 1211 Genève 4, Switzerland.
authors.forename: A P
authors.initials: AP
authors.lastname: Petrović
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authors.lastname: Lortz
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authors.lastname: Santi
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authors.lastname: Berthod
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authors.lastname: Dubois
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authors.lastname: Decroux
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authors.lastname: Demuer
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authors.lastname: Antunes
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authors.lastname: Paré
authors.forename: D
authors.initials: D
authors.lastname: Salloum
authors.forename: P
authors.initials: P
authors.lastname: Gougeon
authors.forename: M
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authors.lastname: Potel
authors.forename: O
authors.initials: O
authors.lastname: Fischer