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 |
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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. |
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ISSN: | 0921-4534 1873-2143 |
DOI: | 10.1016/j.physc.2017.08.006 |