Reentrant vortex lattice transformation in four-fold symmetric superconductors

Details Reentrant vortex lattice transformation in four-fold symmetric superconductors Reentrant vortex lattice transformation in four-fold symmetric superconductors

2002-05-12

arxiv.org/abs/cond-mat/0205245v1

Phys. Rev. Lett. 89, 237004 (2002)

Physics

Condensed Matter

Superconductivity

5 pages, 4 figures,submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.89.237004

The physics behind the rhombic$\to$square$\to$rhombic flux line lattice transformation in increasing fields is clarified on the basis of Eilenberger theory. We demonstrate that this reentrance observed in LuNi$_2$B$_2$C is due to intrinsic competition between superconducting gap and Fermi surface anisotropies. The calculations reproduce not only it but also predict yet not found lock-in transition to a square lattice with different orientation in higher field. In view of physical origin given, this sequence of transitions is rather generic to occur in four-fold symmetric superconductors.

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