T. Koyama et M. Tachiki, MIXING OF THE ORDER PARAMETERS WITH D(X(2)-Y(2))-WAVE AND D(XY)-WAVE SYMMETRY IN D-WAVE SUPERCONDUCTORS, Physical review. B, Condensed matter, 53(5), 1996, pp. 2662-2666
We derive the Ginzburg-Landau equation for two-dimensional d-wave supe
rconductors with fourfold symmetry. The two d-wave components of the o
rder parameter with d(x2-y2) and d(xy) symmetry are mixed by the compo
nent of a magnetic field perpendicular to the two-dimensional plane, T
he mixing of the two components causes a significant paramagnetic effe
ct in the strong-field region.