Vortex lattice structural transitions: a Ginzburg-Landau model approach.
We analyze the rhombic to square vortex lattice phase transition in anisotropic superconductors using a variant of Ginzburg-Landau theory. The mean-field phase diagram is determined to second order in the anisotropy parameter, and shows a reorientation transition of the square vortex lattice with respect to the crystal lattice. We then derive the long-wavelength elastic moduli of the lattices, and use them to show that thermal fluctuations produce a reentrant rhombic to square lattice transition line, similar to recent studies which used a nonlocal London model.
Klironomos
A D
AD
Department of Physics, University of Florida, P.O. Box 118440, Gainesville, FL 32611-8440, USA.
Dorsey
Alan T
AT