Magnetic flux relaxation of epitaxial YBa2Cu3O7-δ films at low temperatures

J. Lensink, C.F.J. Flipse, J. Roobeek, R. Griessen, B. Dam

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Abstract

In this paper we present magnetic flux relaxation mea critical current Jc measurements on epitaxial coevaporated films of YBa2Cu3O7-δ superconductor. We measured a critical current of 3.5 * 1011 A/m2 at 4.2 K and 1.3 * 1010 A/m2 at 77 K. Jc depends strongly on the magnetic field B for B applied perpendicularly to the surface. The magnetization relaxation M(t) is logarithmic in time. In contrast to single crystals and polycrystalline samples the normalized magnetization relaxation tends towards a constant value at low temperatures and is weakly field-dependent.

Original languageEnglish
Pages (from-to)663-664
Number of pages2
JournalPhysica C: Superconductivity and its applications
Volume162-164
Issue numberPART 1
DOIs
Publication statusPublished - Dec 1989
Externally publishedYes

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