Abstract
Within the framework of both thermally activated and quantum-tunneling flux-creep models, an exact treatment of the activation energy, the quantum tunneling and the flux-creep rate in high- T c superconductors is presented. For a typical quartic pinning potential in a various medium, the parameter-dependent activation energy and quantum tunneling of the system are studied in detail. Reliable determinations of the magnetic relaxation rate for a given strong type-II high- T c superconductor will enable a check of the validity of the theoretical results.
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