Phase Diagram and Spectroscopy of FFLO states of two-dimensional d-wave superconductors
A. B. Vorontsov, J. A. Sauls and M. J. Graf
- Date: June 11, 2005
Physical Review B 72, 184501 (2005)
Experimental evidence suggests that the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state may be realized in
the unconventional, heavy-fermion superconductor CeCoIn5. We present a self-consistent
calculation of the
field versus temperature phase diagram and order parameter structures for the FFLO states of
quasi-two-dimensional d-wave superconductors. We calculate the spatially nonuniform order parameter, free
energy density, and local density of states for magnetic fields parallel to the superconducting planes.
We predict that the lower critical magnetic field transition between the spatially uniform and nonuniform
FFLO state is second order. We discuss the signatures of the nonuniform FFLO state which should be
observable in scanning tunneling microscopy measurements of the local density of states.