Time dependence of the paramagnetic Meissner effect: Comparison between model calculations and experiments
J. Magnusson, J.-O. Andersson, M. Björnander, P. Nordblad, P. Svedlindh
DOI 10.1103/PhysRevB.51.12776 · Physical Review B
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Abstract
Experimental results of the temperature, field, and time dependence of the magnetization in high-temperature superconductors displaying the paramagnetic Meissner effect are compared with numerical results from model calculations. In experiments the relaxation rate of the zero-field-cooled magnetization exhibits novel field-dependent properties and the field-cooled magnetization is found to increase with time. A model based on an ensemble of superconducting loops, each loop containing an ordinary Josephson junction or a π junction, is shown to be able to account for most of the experimental results. The time-dependent magnetization is explained by thermally activated flipping of spontaneous orbital magnetic moments, a dynamical process which is fundamentally different from the flux-creep phenomenon usually observed in type-II superconductors.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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