Doping dependent time-reversal symmetric nonlinearity of YBa2Cu3O7-d thin films
Abstract
We have measured the temperature dependent third harmonic response from a series of under-doped YBa2Cu3O7-d thin films to address the mechanism of nonlinearity in these samples. We find that the intrinsic Ginzburg-Landau nonlinearity near Tc is doping dependent, with the sample becoming more nonlinear as it is under-doped. The results are consistent with the doping dependence of the condensation energy of YBa2Cu3O7-d.
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