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Oscillatory melting temperature of the vortex smectic phase in layered superconductors

By S.N. Gordeev, A.A. Zhukov, P.A.J. de Groot, A.G.M. Jansen, R. Gagnon and L. Taillefer

Abstract

We report on transport measurements of YBa 2Cu 3O 7- delta single crystals with different oxygen contents in the geometry B, J||ab (JperpB). Our data show that the vortices become confined between the Cu-O planes below a well-defined temperature at which the effective size 2 xi of the vortex core is approximately equal to the period of the Cu-O layers. This confinement strongly increases the vortex liquid freezing temperature. A new melting line is found separating a vortex liquid and a smectic phase, which shows an oscillatory field dependence reflecting differences between commensurate and incommensurate smectic states

Topics: QC
Year: 2000
OAI identifier: oai:eprints.soton.ac.uk:14733
Provided by: e-Prints Soton
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