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arXiv · 0803.1698

Instability of square vortex lattice in d-wave superconductors is due to paramagnetic depairing

Norihito Hiasa·Ryusuke Ikeda
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Abstract

Effects of the paramagnetic depairing on structural transitions between vortex lattices of a quasi two dimensional d-wave superconductor are examined. It is found that, in systems with Maki parameter $α_{\rm M}$ of order unity, a square lattice induced by a d-wave pairing is destabilized with {\it increasing} fields, and that a reentrant rhombic lattice occurs in higher fields. Further, a weak Fermi surface anisotropy competitive with the pairing symmetry induces another structural transition near $H_{c2}$. These results are consistent with the structure changes of the vortex lattice in CeCoIn$_5$ in ${\bf H} \parallel c$ determined from recent neutron scattering data.

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Norihito Hiasa, Ryusuke Ikeda. 2008-06-12. Instability of square vortex lattice in d-wave superconductors is due to paramagnetic depairing. https://doi.org/10.1103/physrevlett.101.027001

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