Specific heat of an anisotropic superconductor: Nb3X4 with X=S, Se, and Te
Hiroyuki Okamoto, Hiromi Taniguti, Yutaka Ishihara
DOI 10.1103/PhysRevB.53.384 · Physical Review B
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Abstract
The specific heats of Nb3S4, Nb3Se4, and Nb3Te4 were measured in the temperature range from 0.5 to 30 K. The magnitude of the jump at the superconducting transition temperature Tc was 1.11±0.02γTc for Nb3S4 and 0.66±0.01γTc for Nb3Se4. The superconducting property for both compounds is discussed on the basis of the weak-coupling BCS theory as extended by Clem to include the effects of energy-gap anisotropy. We estimated the mean-squared anisotropy 〈a2〉=0.07±0.02 and the reduced-energy gap 2ɛ0/(kBT)=3.1±0.1 for Nb3S4, and 〈a2〉=0.14±0.03 and 2ɛ0/(kBT)=2.8±0.1 for Nb3Se4. For Nb3Te4, although it becomes superconducting at about 2 K in the electrical-resistivity measurement, an excess of specific heat due to the superconducting transition was not found down to about 0.5 K. We also discuss the superconducting property of Nb3Te4. © 1996 The American Physical Society.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb3S4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.78 | Pressure not reported | midpoint |
| Nb3Se4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.31 | Pressure not reported | midpoint |
| Nb3Te4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.95 | Pressure not reported | unknown |
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