Experimental evidence for a two-band superconducting state of NbSe2 single crystals

Details Experimental evidence for a two-band superconducting state of NbSe2 single crystals Experimental evidence for a two-band superconducting state of NbSe2 single crystals

2010-07-06

arxiv.org/abs/1007.0857v1

Phys. Rev. B 82, 014524 (2010)

Physics

Condensed Matter

Superconductivity

5 pages, 2 figures

Scientific paper

10.1103/PhysRevB.82.014524

We report on measurements and a detailed analysis of the reversible magnetization of superconducting NbSe2 single crystals. By comparing the experimental data with Ginzburg Landau theory we show that superconductivity in NbSe2 cannot be explained by an anisotropic single-band, but by a multi-band scenario. Applying a simple two-band model reveals the basic mixed-state parameters, which are quite different in the two bands. We identify a strongly anisotropic band that determines the properties at high magnetic fields, and a second almost isotropic band that dominates at low fields. Our method is well suited for distinguishing anisotropic single-band from multi-band superconductivity in various materials.

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