Hysteretic ac losses in high-temperature superconductors
- 23 January 1989
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 54 (4) , 386-388
- https://doi.org/10.1063/1.101454
Abstract
Theory of ac losses in the type II superconductors in the frame of the critical state model [J. Thompson, M. Maley, and J. R. Clem, J. Appl. Phys. 50, 3531, 3518 (1979)] is applied to high Tc materials (Y-Ba-Cu-O) assuming an exponential drop of the critical current density Jc with both magnetic field and temperature. The dependence of dc magnetic field (H1) at which ac loss minimum occurs on an amplitude of ac magnetic field (h0) and on temperature Tc is calculated numerically. The two maxima of the total ac losses are found: one of them is very close to Tc and second maximum below Tc shifts to lower temperatures with increasing ac or dc magnetic field.Keywords
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