Instability of Square Vortex Lattice in d-Wave Superconductors is due to Paramagnetic Depairing

Norihito Hiasa; Ryusuke Ikeda

doi:10.1103/PhysRevLett.101.027001

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Instability of Square Vortex Lattice in d-Wave Superconductors is due to Paramagnetic Depairing

Norihito Hiasa, Ryusuke Ikeda

DOI 10.1103/PhysRevLett.101.027001 · Physical Review Letters

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Abstract

The effects of paramagnetic depairing on structural transitions between vortex lattices of a quasi-two-dimensional d-wave superconductor are examined. We find that, when the Maki parameter αM is of order unity, a square lattice induced by a d-wave pairing is destabilized with 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 Hc2. These results are consistent with the structure changes of the vortex lattice in CeCoIn5 in H∥c determined from recent neutron scattering data.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
CeCoIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
TmNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown