Physics – Condensed Matter – Superconductivity
Scientific paper
2006-05-02
Phys. Rev. Lett. 98, 057003 (2007)
Physics
Condensed Matter
Superconductivity
4 pages, Revtex
Scientific paper
10.1103/PhysRevLett.98.057003
We report measurements of the temperature dependence of both in-plane and out-of-plane penetration depths ($\lambda_a$ and $\lambda_c$ respectively) in 2\textit{H}-NbSe$_2$. Measurements were made with a radio-frequency tunnel diode oscillator circuit at temperatures down to 100 mK. Analysis of the anisotropic superfluid density shows that a reduced energy gap is located on one or more of the quasi-two-dimensional Nb Fermi surface sheets rather than on the Se sheet, in contrast to some previous reports. This result suggests that the gap structure is not simply related to the weak electron-phonon coupling on the Se sheet and is therefore important for microscopic models of anisotropic superconductivity in this compound.
Brison Jean-Pascal
Carrington Alan
Diener Peter
Fletcher J. D.
Giannetta Russell W.
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