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26 April 2024 |
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Rotation of Triangular Vortex Lattice in the Two-Band Superconductor MgB2 | | Tomoya Hirano
; Kenta Takamori
; Masanori Ichioka
; Kazushige Machida
; | | Date: |
27 Apr 2013 | | 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 field-dependence of twoband
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. | | Source: | arXiv, 1304.7314 | | Services: | Forum | Review | PDF | Favorites | |
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