Time-dependent response and the de Almeida–Thouless line in R 1:2:3 superconductors

As shown recently, the time-dependent response in high-temperature superconductors can be well evaluated on the basis of the classical theory of first-order relaxation processes, if the temperature is low enough. In this article we extend our investigation to the high-temperature limit and show that...

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Bibliographic Details
Published in:Journal of applied physics 1990-05, Vol.67 (9), p.5058-5060
Main Authors: Foldeaki, M., McHenry, M. E., Koszegi, L., O’Handley, R. C., Dunlap, R. A.
Format: Article
Language:English
Subjects:
360204 - Ceramics, Cermets, & Refractories- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTALS
DYSPROSIUM COMPOUNDS
DYSPROSIUM OXIDES
ELECTRONIC EQUIPMENT
FLUXMETERS
FUNCTIONS
GADOLINIUM COMPOUNDS
GADOLINIUM OXIDES
HYSTERESIS
MAGNETIC FIELDS
MAGNETIZATION
MATERIALS SCIENCE
MEASURING INSTRUMENTS
MICROWAVE EQUIPMENT
OXIDES
OXYGEN COMPOUNDS
POLYCRYSTALS
POWDERS
RARE EARTH COMPOUNDS
RELAXATION
RESPONSE FUNCTIONS
SQUID DEVICES
SUPERCONDUCTING DEVICES
SUPERCONDUCTORS
TIME DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
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Summary:As shown recently, the time-dependent response in high-temperature superconductors can be well evaluated on the basis of the classical theory of first-order relaxation processes, if the temperature is low enough. In this article we extend our investigation to the high-temperature limit and show that the decrease of the logarithmic relaxation rate is an experimental consequence of the relaxation model and not a critical slowing down. On the basis of a comparison of the different classical relaxation processes and superconductive time-dependent response the special features of the superconductor can be interpreted. It is shown that all irreversible relaxation results in thermal hysteresis as a consequence of the difference between the time scale of the relaxation and the experiment. This feature introduces difficulties into the experimental determination of the de Almeida–Thouless lines.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.344669