Effective electric field in dc magnetization measurements: Comparing magnetization to transport critical currents

J. D. Hettinger, D. H. Kim, K. E. Gray, U. Welp, R. T. Kampwirth, M. Eddy

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

We report values of critical current (Jc) for Tl 2Ba2CaCu2Ox(Tl-2212) epitaxial thin films in magnetic fields up to 5 T and at temperatures of 5, 40, and 77 K determined from dc magnetization and using a standard transport technique. Although we verify the applicability of Bean's model [Rev. Mod. Phys. 36, 31 (1964)], these values only agree at small applied magnetic fields and at low temperatures. Our results indicate that the differences observed in J c's determined from the two techniques may be understood by considering only the field-dependent, nonlinear E-J characteristic and the "effective" electric-field criterion used in determining Jc.

Original languageEnglish (US)
Pages (from-to)2153-2155
Number of pages3
JournalApplied Physics Letters
Volume60
Issue number17
DOIs
StatePublished - 1992
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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