  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.
