Short-time relaxation of the critical current in oriented grainedYBa2Cu3Oxand granular (Bi,Pb)2Sr2Ca2Cu3Ox

Autor:	U. Wiech, C. Keller, H. Küpfer, R. Meier-Hirmer, C. Politis, H.L. Luo, S. M. Green, Kamel Salama, Venkat Selvamanickam
Rok vydání:	1990
Předmět:	chemistry.chemical_classification Physics Superconductivity High-temperature superconductivity Condensed matter physics Magnetic field law.invention chemistry law Relaxation (physics) Electric current Inorganic compound Current density Line (formation)
Zdroj:	Physical Review B. 41:838-841
ISSN:	1095-3795 0163-1829
DOI:	10.1103/physrevb.41.838
Popis:	The time-dependent behavior of the critical current density {ital j}{sub {ital c}} is investigated by ac inductive measurements. The variation of {ital db}/{ital dt} of the ac field between 0.1 and 3 T/s reveals a short-time relaxation in the millisecond regime before {ital j}{sub {ital c}} exhibits the familiar logarithmic decay. At fields above the irreversibility line only this short-time relaxation is observed. Our experimental time scale allows us to obtain the unrelaxed critical current density {ital j}{sub {ital c}0} at certain fields and temperatures.
Databáze:	OpenAIRE
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