Flux-lattice melting and flux creep in a high-Tcsuperconductor
- 13 November 1989
- journal article
- Published by IOP Publishing in Journal of Physics: Condensed Matter
- Vol. 1 (45) , 8945-8960
- https://doi.org/10.1088/0953-8984/1/45/018
Abstract
The authors report measurements of the magnetisation-derived critical current jc in TlBa2Ca3Cu4Ox a 122 K superconductor. Analysis of the field H*c2, at which jc scales to zero, naturally falls into two regimes: a low-temperature regime, which can be described by flux-lattice melting, and a high-temperature regime dominated by flux creep. In the latter regime, the scaling of both H*c2 and the sample resistivity with temperature are in good agreement with a model proposed by Tinkham, when anisotropy effects are taken into account. From the former regime, they infer Hc2//(T=0) approximately=430 T.Keywords
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