Rotation of Triangular Vortex Lattice in the Two-Band Superconductor MgB2

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.

4 pages, 4 figures

References in corpus (4)

• Type-1.5 Superconductors
• Ginzburg-Landau theory of vortices in a multi-gap superconductor
• Metastable Vortex Lattice Phases in Superconducting MgB2
• Electronic Structures of CaAlSi with Different Stacking AlSi Layers by First-Principles Calculations

Cited by in corpus (12)

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• Fulde-Ferrell-Larkin-Ovchinnikov States in Two-Band Superconductors
• Rotation of the magnetic vortex lattice in Ru7B3 driven by the effects of broken time-reversal and inversion symmetry
• Interplay between effective mass anisotropy and Pauli paramagnetic effects in a multiband superconductor--Application to Sr2RuO4--
• Conventional Superconductivity in the Doped Kagome Superconductor Cs(V0.86Ta0.14)3Sb5 from Vortex Lattice Studies
• Non-equilibrium structural phase transitions of the vortex lattice in MgB2
• Structural Transition Kinetics and Activated Behavior in the Superconducting Vortex Lattice
• Rotational transition, domain formation, dislocations and defects in vortex systems with combined six- and 12-fold anisotropic interactions
• Structural studies of metastable and equilibrium vortex lattice domains in MgB2
• Effects of magnetic and non-magnetic doping on the vortex lattice in MgB${}_2$
• Field-angle dependent vortex lattice phase diagram in MgB2
• Activated vortex lattice transition in a superconductor with combined sixfold and twelvefold anisotropic interactions