Harmonic generation by field modulation of the microwave complex impedance of high-Tc superconductors

M. Golosovsky, D. Davidov, E. Farber, T. Tsach and M. Schieber

Physica A: Statistical Mechanics and its Applications, 1990, vol. 168, issue 1, 353-366

Abstract: The microwave transmission through thin superconducting films of Bi Sr Ca Cu O and Y Baz. Cu O was studied in the presence of an oscillating magnetic field, H1 cos(2πƒ0t), and a dc magnetic field, H0. The oscillating field generates many even harmonics (kƒ0, k=2, 4, 6,…) in the low frequency spectrum of the transmitted microwave for H0=0. For H0≠0 additional odd harmonics appear. We demonstrate the presence of irreversibilities in the harmonic signal and “memory” effect in the harmonic generation below a certain temperature, Tirr. The harmonic generation is explained by the non-linear response of the microwave transmission (through the non-linear response of the complex resistivity) to a periodic applied field. Following Portis et al., we show the dependence of the complex resistivity on the magnitude of the applied field and suggest a simple model. The model can account for (a) the harmonic generation, (b) the interesting oscillatory dependence of the even harmonic signal on H0 and (c) the disappearance of all harmonics except the first harmonic for H0⪢H1. The different onset temperatures for (a) the harmonic generation and (b) the change in the microwave transmittance may suggest two superconducting temperatures associated with the intergrain region, TcJ, and the grains themselves, Tcg, as suggested by theoretical models for granular superconductors. For our Bi Sr Ca Cu O thin film we find Tcg=(102±2)K, and TcJ=(92±3)K.

Date: 1990
References: View complete reference list from CitEc
Citations:

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/0378437190903878
Full text for ScienceDirect subscribers only. Journal offers the option of making the article available online on Science direct for a fee of $3,000

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:168:y:1990:i:1:p:353-366

DOI: 10.1016/0378-4371(90)90387-8

Access Statistics for this article

Physica A: Statistical Mechanics and its Applications is currently edited by K. A. Dawson, J. O. Indekeu, H.E. Stanley and C. Tsallis

More articles in Physica A: Statistical Mechanics and its Applications from Elsevier
Bibliographic data for series maintained by Catherine Liu ().