Model for the broadening of the resistive transition in YBa2Cu3O7-δ thin films

A. Casaca, G. Bonfait, M. Lenkens, G. Müller, K. Lander, J. A. Edwards

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Abstract

A new analysis of the broadening of the resistive transition under magnetic field in YBa2Cu3O7-δ thin films is presented, providing a very good description of the ρ(T) behaviour up to 50% of the normal state resistivity, for fields up to 18 T. We describe films as a collection of clean regions which present a sharp resistivity drop, as observed in clean single crystals and attributed to the vortex lattice melting transition. The structural or chemical inhomogeneities existing in films are modelled by a distributed melting temperature. The field dependence of the distribution width is coherently described by our model. This model, using the classical flux flow theory, yields values for dBc2/dT and for the vortex viscosity in close agreement with those currently accepted.

Original languageEnglish
Pages (from-to)75-81
Number of pages7
JournalSuperconductor Science and Technology
Volume10
Issue number2
DOIs
Publication statusPublished - 1 Feb 1997

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