Fermi surface topology and vortex state in MgB2
arXiv:cond-mat/0304194 · doi:10.1016/j.physc.2004.02.152
Abstract
Based on a detailed modeling of the Fermi surface topology of MgB2 we calculated the anisotropy of the upper critical field Bc2 within the two gap model. The sigma-band is modeled as a distorted cylinder and the pi-band as a half-torus, with parameters determined from bandstructure calculations. Our results show that the unusual strong temperature dependence of the Bc2 anisotropy, that has been observed recently, can be understood due to the small c-axis dispersion of the cylindrical Fermi surface sheets and the small interband pairing interaction as obtained from bandstructure calculations. We calculate the magnetic field dependence of the density of states within the vortex state for field in c-axis direction and compare with recent measurements of the specific heat on MgB2 single crystals.
2 pages, 2 figures
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Cited by in corpus (5)
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- Muon spin rotation studies of electronic excitations and magnetism in the vortex cores of superconductors
- Electronic state around vortex in a two-band superconductor
- Coherent current states in a two-band superconductor
- Superconductivity of Magnesium Diboride: Theoretical Aspects