A new method for a local study of nonlinear microwave properties of superconductors

Evgeny E. Pestov; Yury N. Nozdrin; Vladislav V. Kurin

paper

A new method for a local study of nonlinear microwave properties of superconductors

arXiv:cond-mat/0005501

Abstract

We report a set of experimental data on local third-harmonic generation at microwave frequencies (0.5 GHz) in $Y B a_{2} C u_{3} O_{7}$ and Nb films. For local investigations of the nonlinear response a probe with inductive coupling was elaborated. The map of the nonlinear microwave response of a $Y B a_{2} C u_{3} O_{7}$ thin film is plotted below $T_{c}$ with high resolution. The third-harmonic power is measured as a function of temperature, input power and dc magnetic field at some areas of the film. The correlation between the depinning current density $J_{p}$ and the nonlinear microwave response is also demonstrated.

4 pages, 5 Postscript figures