Harmonic generation from YBCO microwave resonators

Details Harmonic generation from YBCO microwave resonators Harmonic generation from YBCO microwave resonators

1999-04-06

arxiv.org/abs/cond-mat/9904080v1

Physics

Condensed Matter

Superconductivity

4 pages, 3 PostScript figures, Submitted to Applied Physics Letters. More details and related publications are available at

Scientific paper

Measurement of harmonic power on a suspended stripline microwave resonator patterned out of thin film YBa_2Cu_3O_7 (YBCO) has been carried out as a function of temperature and microwave power. The third harmonic power P_3 shows a subtle nonlinear dependence on the fundamental power P_1 on a log-log scale. Fit to a straight line yields slopes of P_3 vs. P_1 between 1.5 to 3, contrary to elementary calculations that predict a slope of exactly 3. It is shown that third harmonic power generated from higher order terms in the nonlinear impedance could account for the discrepancy quantitatively without resorting to any additional ad-hoc assumptions. Results of measurement of fifth harmonic power is presented as a confirmation. A small second harmonic power is also observed that does not show anomalous power dependence within the experimental accuracy.

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