Local magnetic relaxation in high-temperature superconductors

Y. Abulafia, A. Shaulov, Y. Wolfus, R. Prozorov, L. Burlachkov, Y. Yeshurun, D. Majer, E. Zeldov, V. M. Vinokur

Research output: Contribution to journalArticlepeer-review

102 Scopus citations

Abstract

A novel Hall probe array technique is used to measure the spatial distribution and time dependence of the magnetic induction in YBa2Cu3O7-δ crystals. Analysis of the data based on the flux diffusion equation allows a direct, model-independent determination of the local activation energy U and the logarithmic time scale t0 for flux creep. The results indicate that the spatial variations of U are small (±kT) and that U increases logarithmically with time. The time t0 is inversely proportional to the field and it exhibits a nonmonotonic temperature dependence. These results confirm theoretical predictions based on the logarithmic solution of the flux diffusion equation.

Original languageEnglish
Pages (from-to)2404-2407
Number of pages4
JournalPhysical Review Letters
Volume75
Issue number12
DOIs
StatePublished - 1995

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