Physics – Condensed Matter – Superconductivity
Scientific paper
2004-04-26
Physics
Condensed Matter
Superconductivity
Submitted to Physical Review B
Scientific paper
We calculate the density of states $N$ and the the thermal conductivity $\kappa $ in layered superconductors for rotating in-plane magnetic field by using approximate analytical expressions for Abrikosov's vortex lattice state. For a gap with d$_{xy} $- orbital symmetry we find that the differences $\Delta N$ and $\Delta\kappa$ between field directions parallel to the antinodes and parallel to the nodes of the gap are positive for lower fields and change sign for higher fields near $H_{c2} $. For increasing impurity scattering, $\Delta N$ and $\Delta\kappa$ decrease due to a broadening of certain peaks in the angle-resolved density of states. The frequency dependencies of the amplitudes $\Delta N$ and $\Delta\kappa$ exhibit similar crossover behavior at low frequencies which give rise to a sign change of $\Delta\kappa$ at low $T/T_c $. We conclude that variations of the specific heat and thermal conductivity can be observed only in the clean and low temperature limits.
Fay Damien
Tewordt L.
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