Rotation of triangular vortex lattice in the two-band superconductor MgB2

Tomoya Hirano, Kenta Takamori, Masanori Ichioka, Kazushige MaChida

Research output: Contribution to journalArticle

8 Citations (Scopus)

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 languageEnglish
Article number063708
Journaljournal of the physical society of japan
Volume82
Issue number6
DOIs
Publication statusPublished - Jun 1 2013

Keywords

  • First-principles band calculation
  • MgB
  • Quasiclassical eilenberger theory
  • Two-band superconductivity
  • Vortex lattice morphology

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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