Title :
Disorder Effects on the Intrinsic Nonlinear Current Density in YBa2Cu3O7−δ
Author :
Booth, James C. ; Andersen, Brian M. ; Hirschfeld, P.J.
Author_Institution :
Nat. Inst. of Stand. & Technol., Boulder
fDate :
6/1/2007 12:00:00 AM
Abstract :
We present harmonic generation measurements of the intrinsic nonlinear current density j2 of YBa2Cu3O7-delta (YBCO) films at temperatures close the Tc. Experiments on a range of different quality samples allow us to extract the dependence of j2 on the penetration depth of the superconductor. In order to model these results, we calculate the intrinsic nonlinear current response of dx 2 -y 2-wave superconductors in the Meissner regime in the presence of nonmagnetic impurities within the self-consistent T-matrix approximation.
Keywords :
Meissner effect; barium compounds; current density; d-wave superconductivity; harmonic generation; high-temperature superconductors; penetration depth (superconductivity); superconducting thin films; yttrium compounds; Meissner regime; YBaCuO - System; dx 2 -y 2-wave superconductors; disorder effects; harmonic generation; intrinsic nonlinear current density; nonmagnetic impurities; penetration depth; self-consistent T-matrix approximation; superconducting films; Current density; Current measurement; Density measurement; Impurities; Superconducting epitaxial layers; Superconducting films; Superconducting microwave devices; Superconducting transmission lines; Temperature dependence; Yttrium barium copper oxide; High temperature superconductor; nonlinear current density; nonlinear microwave response;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2007.897192
