Ginzburg-Landau theory for ap-waveSr2RuO4superconductor: Vortex core structure and extended London theory

Abstract

Based on a two dimensional odd-parity superconducting order parameter for Sr 2 RuO 4 with p-wave symmetry, we investigate the single vortex and vortex lattice structure of the mixed phase near H c1 . Ginzburg-Landau calculations for a single vortex show a fourfold structure with an orientation depending on the microscopic Fermi surface properties. The corresponding extended London theory is developed to determine the vortex lattice structure and we find near H c1 a centered rectangular vortex lattice. As the field is increased from H c1 this lattice continuously deforms until a square vortex lattice is achieved. In the centered rectangular phase the field distribution, as measurable through µSR experiments, exhibits a characteristic two peak structure (similar to that predicted in high temperature and borocarbide superconductors).Typeset using REVT E X 10

Muon spin rotation studies of electronic excitations and magnetism in the vortex cores of superconductors

“…Anisotropy may also be incorporated into analytical GL models. The TF-µSR study of Sr 2 RuO 4 [63] employed a GL model that accounts for p-wave symmetry and Fermi surface anisotropy [67,68]. Since all of the theoretical models accounting for anisotropy introduce additional fitting parameters, they are seldom used in µSR studies.…”

Vortex States of theEuModel forSr2RuO4Kita1 1999Phys. Rev. Lett.232200View full textAdd to dashboardCite

“…The vortex states of the E u model for Sr 2 RuO 4 have been studied theoretically in a series of papers by Agterberg et al [11][12][13]. Based on a two-component Ginzburg-Landau (GL) functional and following essentially Abrikosov's method [14] which is effective near the upper (H c2 ) and lower (H c1 ) critical fields, they have provided several important predictions.…”

Muon-spin rotation measurements of the vortex state inSr2RuO4: Type-1.5 superconductivity, vortex clustering, and a crossover from a triangular to a square vortex lattice

“…Theoretical calculations of the vortex lattice have been performed using a Ginzburg-Landau (GL) approach based on a two-dimensional odd-parity superconducting order parameter with chiral p-wave symmetry [17]. Fourfold symmetric vortices were predicted that were shown, using an extended London theory, to form triangular coordinated structures close to H c1 that continuously deform into a square lattice as the field is increased.…”