We have measured the temperature dependent third harmonic response from a series of under-doped YBa_2Cu_3O_7-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 YBa_2Cu_3O_7-d.
@article{arxiv.cond-mat/0306416,
title = {Doping dependent time-reversal symmetric nonlinearity of YBa_2Cu_3O_7-d thin films},
author = {Sheng-Chiang Lee and Steven M. Anlage},
journal= {arXiv preprint arXiv:cond-mat/0306416},
year = {2009}
}
Comments
2 pages, 3 figures, submitted to Physica C for M2S-Rio conference press