Anisotropic critical fields of MgB2 single crystals

Details Anisotropic critical fields of MgB2 single crystals Anisotropic critical fields of MgB2 single crystals

2002-07-22

arxiv.org/abs/cond-mat/0207521v1

Acta Physica Polonica B 34, 549 (2003)

Physics

Condensed Matter

Superconductivity

4 pages, 1 figure, to appear in Acta Physica Polonica B, proceedings of the International Conference on Strongly Correlated El

Scientific paper

The recently discovered superconductivity in MgB2 has created the world sensation. In spite of the relatively high superconducting transition temperature Tc=39K, the superconductivity is understood in terms of rare two gap superconductor with energy gaps attached to the sigma- and pi-band. However, this simple model cannot describe the temperature dependent anisotropy in H_c2 or the temperature dependence of the anisotropic magnetic penetration depth. Here we propose a model with two anisotropic energy gaps with different shapes. Indeed the present model describes a number of pecularities of MgB2 which have been revealed only recently through single crystal MgB2.

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