Superconducting phase in Nb1−xTaxSe3 (0.135<x<0.16)
S. Noma, T. Saito, T. Ekino, J. Akimitsu, S. Sueno
DOI 10.1103/PhysRevB.48.9620 · Physical Review B
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Abstract
We have found a superconducting phase in single-crystal Nb1−xTaxSe3 with 0.135<x<0.16 by use of resistivity and susceptibility measurements. Its crystal structure is identical to that of NbSe3, and the superconductivity occurs between x=0.135 and 0.16, a much higher tantalum concentration than that of the known phase with x=0.02–0.08. The highest superconducting transition temperature Tc is obtained as 5.8 K at x=0.148, well beyond the Tc=1.5 K of Nb0.95Ta0.05Se3. Measurements of the upper critical field Hc2 revealed its quasi-two-dimensional nature and the angular dependence of Hc2 is described by an anisotropic effective-mass model, which shows the intrinsic anisotropy of the electron band mass. The superconducting energy gap has been measured with an electron-tunneling technique and the observed gap values are discussed on the basis of the BCS theory.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb1-xTaxSe3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5.8 | Pressure unresolved | onset |
| Nb0.852Ta0.148Se3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5.8 | Pressure unresolved | onset |
| Nb0.95Ta0.05Se3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.5 | Pressure unresolved | unknown |
| Nb0.95Ta0.05Se3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.8 | Pressure unresolved | unknown |
| NbSe3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.5 | 0.6 GPa | unknown |
| NbSe3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5 | 4 GPa | unknown |
| TaSe3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2 | Pressure unresolved | unknown |
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