Superconductivity in quasi-one-dimensional BaNbS3

•Superconductivity in BaNbS3 is first reported in this work.•The superconducting transition temperature is 0.89 K.•An energy gap of 0.245(3) meV is observed.•The superconductivity appears to be BCS-like. BaNbS3 is a quasi-one-dimensional metal possessing Nb-Nb chains. Superconductivity was observed...

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Veröffentlicht in:Physica. C, Superconductivity Superconductivity, 2017-11, Vol.542 (C), p.1-5
Hauptverfasser: Neumeier, J.J., Smith, M.G.
Format: Artikel
Sprache:eng
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Zusammenfassung:•Superconductivity in BaNbS3 is first reported in this work.•The superconducting transition temperature is 0.89 K.•An energy gap of 0.245(3) meV is observed.•The superconductivity appears to be BCS-like. BaNbS3 is a quasi-one-dimensional metal possessing Nb-Nb chains. Superconductivity was observed at the transition temperature Tc = 0.89 K. Specific heat measurements reveal the bulk nature of the superconductivity, and an energy gap Eg = 0.245(3) meV, which agrees well with BCS theory. The upper critical magnetic field was used to estimate the coherence lengths parallel (ξ∥ = 987(17) Å) and perpendicular (ξ⊥ = 204(12) Å) to the Nb-Nb chains. Despite the anisotropy evident through ξ∥/ξ⊥, the large magnitudes of each reveal that coherence extends over a large enough volume that superconductivity in BaNbS3 can be viewed as isotropic on the scale of tens of Nb-Nb distances.
ISSN:0921-4534
1873-2143
DOI:10.1016/j.physc.2017.08.006