Microscopic Derivation of the Ginzburg-Landau Equations for a d-wave Superconductor

Details Microscopic Derivation of the Ginzburg-Landau Equations for a d-wave Superconductor Microscopic Derivation of the Ginzburg-Landau Equations for a d-wave Superconductor

1996-09-26

arxiv.org/abs/cond-mat/9609248v1

Physics

Condensed Matter

ReVTeX, 18 pages, 7 postscript figures. To appear in Phys. Rev. B (Jan. 1, 1997)

Scientific paper

10.1103/PhysRevB.55.559

The Ginzburg-Landau (GL) equations for a d-wave superconductor are derived within the context of two microscopic lattice models used to describe the cuprates: the extended Hubbard model and the Antiferromagnetic-van Hove model. Both models have pairing on nearest-neighbour links, consistent with theories for d-wave superconductivity mediated by spin fluctuations. Analytical results obtained for the extended Hubbard model at low electron densities and weak-coupling are compared to results reported previously for a d-wave superconductor in the continuum. The variation of the coefficients in the GL equations with carrier density, temperature, and coupling constants are calculated numerically for both models. The relative importance of anisotropic higher-order terms in the GL free energy is investigated, and the implications for experimental observations of the vortex lattice are considered.

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