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

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 ${\alpha }_{\mathrm{M}}$ 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 $\mathbf{H}\parallel c$ determined from recent neutron scattering data.

Effects of thermal fluctuation were discussed additionally, and the title was slightly changed. Accepted for publication in Physical Review Letters

References in corpus (3)

• Fulde-Ferrell-Larkin-Ovchinnikov State in Heavy Fermion Superconductors
• Pauli Paramagnetic Effects on Vortices in Superconducting TmNi2B2C
• High field superconducting phase diagrams including Fulde-Ferrell-Larkin-Ovchinnikov vortex states

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• Influence of the Fermi Surface Morphology on the Magnetic Field-Driven Vortex Lattice Structure Transitions in YBa${}_2$Cu${}_3$O${}_{7-\delta }:\delta =$0, 0.15
• Field Dependence of the Superconducting Basal Plane Anisotropy of TmNi2B2C