Nodal quasiparticles and classical phase dluctuations in d-wave superconductors.
We show that the nodal quasiparticles have a significant effect on the classical phase fluctuations in a quasi-two-dimensional d-wave superconductor. They give rise to singularities in the temperature behavior of some of the coupling constants in the phase-only effective action. One of the consequences is that the classical XY model is not adequate for the description of the superconducting fluctuations in d-wave superconductors at low temperatures.
Department of Physics, Brock University, St. Catharines, Ontario, Canada L2S 3A1.
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KV
Samokhin
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Mitrović