Vortex Lattice Structural Transitions: a Ginzburg-Landau Model Approach

Details Vortex Lattice Structural Transitions: a Ginzburg-Landau Model Approach Vortex Lattice Structural Transitions: a Ginzburg-Landau Model Approach

2003-02-20

arxiv.org/abs/cond-mat/0302422v2

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures, final version with various referee suggested modifications, scheduled to appear in PRL

Scientific paper

10.1103/PhysRevLett.91.097002

We analyze the rhombic to square vortex lattice phase transition in anisotropic superconductors using a variant of Ginzburg-Landau (GL) 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.

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