Studies of vortex dynamics in hts and conventional amorphous superconductors using a sapphire ring resonator

N.-C. Yeh

doi:10.1117/12.2303155

1 January 1994 Studies of vortex dynamics in hts and conventional amorphous superconductors using a sapphire ring resonator

N.-C. Yeh

Author Affiliations +

Proceedings Volume 2250, International Conference on Millimeter and Submillimeter Waves and Applications 1994; 22503U (1994) https://doi.org/10.1117/12.2303155
Event: Millimeter and Submillimeter Waves and Applications: International Conference, 1994, San Diego, CA, United States

Abstract

Vortex critical dynamics of superconducting amorphous Mo3Si films are investigated at microwave frequencies from 8 to 19 GHz by using a high-Q sapphire ring resonator at the whispering gallery (WG) modes. It is found that the microwave surface resistance R3 in the vortex-state of a-Mo3Si follows the scaling relation R3 e- 611(2-2).R Ã¢â‚¬Å¾(I), where 6 E 11Ã¢â‚¬â€ (TITm)I, TM (H) is the vortex-glass melting temperature in a constant magnetic field H, R3 is a scaling function, f _---F-_- fb-" , and v P.,- 2/3, z :::.: 3.0 are the static and dynamics exponents associated with the vortex- glass transition1'2. In contrast, the vortex dynamics at microwave frequencies for high-temperature superconductors (HTS) such as Nd1.85Ce0.15Cu0.4 and YBa2Cu307 is associated with vortex depinning and diffusion1'2'3 rather than the critical dynamics of the vortex-glass transition1'2. Physical quantities associated with the viscous motion of vortex-liquid in high-temperature superconductors are derived from the microwave measurements.

Citation Download Citation

N.-C. Yeh "Studies of vortex dynamics in hts and conventional amorphous superconductors using a sapphire ring resonator", Proc. SPIE 2250, International Conference on Millimeter and Submillimeter Waves and Applications 1994, 22503U (1 January 1994); https://doi.org/10.1117/12.2303155

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