期刊
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
卷 82, 期 6, 页码 -出版社
PHYSICAL SOC JAPAN
DOI: 10.7566/JPSJ.82.063708
关键词
vortex lattice morphology; two-band superconductivity; MgB2; first-principles band calculation; quasi-classical Eilenberger theory
资金
- KAKENHI [21340103]
- Grants-in-Aid for Scientific Research [21340103] Funding Source: KAKEN
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 Hc(2) 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 sigma-and pi-bands. The reentrant transition at low temperature reflects the Fermi velocity anisotropy of the sigma-band.
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