Physics – Condensed Matter – Superconductivity
Scientific paper
1998-02-25
Physics
Condensed Matter
Superconductivity
To be published in: J. Phys. Chem Solids, Proceedings of SNS97, 3 pages, 3 Postscript figures
Scientific paper
10.1016/S0022-3697(98)00122-X
We consider the problem of the vortex contribution to thermal properties of dirty d-wave superconductors. In the clean limit, Volovik has argued that the main contribution to the density of states in a d-wave superconductor arises from extended quasiparticle states which may be treated semiclassically, giving rise to a specific heat contribution \delta C(H)\ltsim H^{1/2} . We show that the extended states continue to dominate the dirty limit, but lead to a H \log H behavior at the lowest fields, H_{c1}\ll H\ll H_{c2}. This crossover may explain recent discrepancies in specicific heat measurements at low temperatures and fields in the cuprate superconductors. We further discuss the field dependence of transport properties within the same model.
Hirschfeld Peter J.
Kuebert C.
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