Angular Dependence of the Activation Energy in YBCO/PBCO Multilayers

A. Casaca, G. Bonfait, V. Galindo, J. P. Sénateur, D. Feinberg

Research output: Contribution to journalArticle

Abstract

The activation energy in several (YBCO)m/(PBCO)n superconducting multilayers was deduced from resistivity measurements in magnetic fields up to 16 T, as a function of the angle between the magnetic field and the ab planes. The activation energy U0(B,θ) scales with a reduced field Bred=B(sin2 θ+cos2 θ/Γ2)1/2, with an angle dependent anisotropy parameter Γ. A crossover from U0∝log Bred, at low Bred, to U0∝(Bred)α at high Bred, is also observed. The implications of these results on vortex dynamics and on the coupling between the superconducting layers will be discussed.

Original languageEnglish
Pages (from-to)1459-1463
Number of pages5
JournalJournal Of Low Temperature Physics
Volume117
Issue number5-6
Publication statusPublished - 1 Dec 1999

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