Superconducting phase in Nb1-xTaxSe3 (0.135<x<0.16)

S. Noma, T. Saito, T. Ekino, J. Akimitsu, S. Sueno

Research output: Contribution to journalArticle

3 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)9620-9627
Number of pages8
JournalPhysical Review B
Volume48
Issue number13
DOIs
Publication statusPublished - Jan 1 1993
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics

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