Relation between micro-structure and transport properties of epitaxial YBa2Cu3O7-δ thin films

G. Doornbos*, B. Dam, J. C. Martínez, R. Surdeanu, U. Poppe, R. Griessen

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

7 Citations (Scopus)

Abstract

In order to understand the origin of the high critical current densities observed in thin superconducting films compared to single crystals we measured in several epitaxial YBa2Cu3O7-δ thin films the magnetic field and temperature dependence of the superconducting current density js and the dynamical relaxation rate Q≡dlnjs/dln(dB/dt). For all samples we found that (i) the superconducting current density js is independent of magnetic field up to a certain field BΦ. The value of this field, which is sample dependent, decreases with increasing temperature; (ii) for fields B>BΦ, the superconducting current density falls off as B-1/2 over several decades; (iii) Q exhibits a sharp decrease for B<BΦ and (iv) Q is essentially constant for B>BΦ. These results can be understood in terms of strong pinning. Based on structural information obtained by AFM and STM we propose a model to explain both the high value and the magnetic field dependence of js and Q.

Original languageEnglish
Pages (from-to)2303-2304
Number of pages2
JournalPhysica C: Superconductivity and its Applications
Volume282
Issue numberPART 4
DOIs
Publication statusPublished - Aug 1997

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