Superconductivity in quasi-one-dimensional BaNbS3
John J. Neumeier, M. G. Smith
Physica C: Superconductivity and its Applications
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 (?? = 987(17) Å) and perpendicular (?? = 204(12) Å) to the Nb-Nb chains. Despite the anisotropy evident through ??/??, 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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