Nonlinear Current Response of a d-wave Superfluid

Details Nonlinear Current Response of a d-wave Superfluid Nonlinear Current Response of a d-wave Superfluid

1999-08-24

arxiv.org/abs/cond-mat/9908332v1

Phys. Rev. B 60, 13125 (1999)

Physics

Condensed Matter

Superconductivity

6 pages, 7 figures, RevTeX, to appear in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.60.13125

Despite several efforts the nonlinear Meissner effect in d-wave superconductors, as has been discussed by Yip and Sauls in 1992, has not been verified experimentally in high-Tc superconductors at present. Here, we reinvestigate the nonlinear response expected in a d-wave superconductor. While the linear H field dependence of the penetration depth, predicted by Yip and Sauls, is restricted by the lower critical field and can be masked by nonlocal effects, we argue that the upturn of the nonlinear coefficient of the quadratic field dependence is more stable and remains observable over a broader range of parameters. We investigate this by studying the influence of nonmagnetic impurities on the nonlinear response. We discuss the difficulties of observing this intrinsic d-wave signature in present day high-Tc films and single crystals.

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