Physics – Condensed Matter – Superconductivity
Scientific paper
2008-03-12
Physics
Condensed Matter
Superconductivity
Effects of thermal fluctuation were discussed additionally, and the title was slightly changed. Accepted for publication in Ph
Scientific paper
10.1103/PhysRevLett.101.027001
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 $\alpha_{\rm M}$ 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.
Hiasa Norihito
Ikeda Ryusuke
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