Abstract
To identify the contributions of the multiband nature and the anisotropy of a microscopic electronic structure to a macroscopic vortex lattice morphology, we develop a method based on the Eilenberger theory near Hc2 combined with the first-principles band calculation to estimate the stable vortex lattice configuration. For a typical two-band superconductor MgB2, successive transitions of vortex lattice orientation that have been observed recently by small angle neutron scattering [Das et al.: Phys. Rev. Lett. 108 (2012) 167001] are explained by the characteristic fielddependence of two-band superconductivity and the competition of sixfold anisotropy between the σ- and π-bands. The reentrant transition at low temperature reflects the Fermi velocity anisotropy of the σ-band.
Original language | English |
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Article number | 063708 |
Journal | journal of the physical society of japan |
Volume | 82 |
Issue number | 6 |
DOIs | |
Publication status | Published - Jun 2013 |
Keywords
- First-principles band calculation
- MgB
- Quasiclassical eilenberger theory
- Two-band superconductivity
- Vortex lattice morphology
ASJC Scopus subject areas
- Physics and Astronomy(all)