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Reentrant vortex lattice transformation in four-fold symmetric superconductors

N. Nakai·P. Miranović·M. Ichioka·K. Machida
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Abstract

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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N. Nakai, P. Miranović, M. Ichioka, K. Machida. 2002-05-12. Reentrant vortex lattice transformation in four-fold symmetric superconductors. https://doi.org/10.1103/physrevlett.89.237004

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