Flux-motion related AC losses in high T/sub c/ superconductors

Author

Chen, Q.Y.

Author_Institution

Texas Center for Superconductivity, Houston Univ., TX, USA

Volume

3

Issue

1

fYear

1993

fDate

3/1/1993 12:00:00 AM

Firstpage

1413

Lastpage

1416

Abstract

The AC losses of high-temperature superconductors in the flux-depinned mixed-state have been treated using the classical magnetic diffusion equation in conjunction with various models of flux-motion. With the imaginary part representing the AC losses, the field- and frequency-dependent AC susceptibilities were investigated. The imaginary component was found to obey a scaling rule with a characteristic frequency, estimated to be approximately 10/sup 5/-10/sup 9/ Hz, that depended on the sample size and normal state resistivity. This frequency range agrees with earlier experimental results, which could not be accounted for previously based upon the notion of thermally activated hopping of vortices. The frequency scaling behaviors using flux-creep and flux-flow models are presented.<>

Keywords

flux creep; flux flow; high-temperature superconductors; losses; magnetic susceptibility; AC susceptibilities; classical magnetic diffusion equation; flux-creep; flux-depinned mixed-state; flux-flow models; flux-motion related AC losses; high T/sub c/ superconductors; high-temperature superconductors; imaginary component; normal state resistivity; sample size; scaling rule; thermally activated hopping of vortices; Conducting materials; Conductivity; Energy dissipation; Frequency; Magnetic flux; Magnetic hysteresis; Magnetic materials; Solids; Superconducting magnets; Superconductivity;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.233633

Filename

233633