Analysis of angular dependence of pinning mechanisms on Ca-substituted YBa2Cu3O7-δ epitaxial thin films

A. Augieri, G. Celentano, U. Gambardella, J. Halbritter, T. Petrisor

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Abstract

The critical current density Jc as a function of the temperature T, magnetic field intensity H and angle between the direction of applied magnetic field and the c-axis of the samples was measured on epitaxial 10at.% Ca-substituted YBa2Cu3O7-δ (YCBCO) thin films grown by the pulsed laser deposition technique on (001)-SrTiO3 (STO) and CeO2 buffered r-cut Al2O3 (CAO) substrates. Films exhibited comparable values of critical temperature (T c∼78K) while higher self-field Jc values for SrTiO3 were observed. Dissipation regimes related to growth boundary and intra-grain pinning mechanisms showed a qualitatively similar contribution for YCBCO films deposited on both substrates when the applied magnetic field direction is parallel to the c-axis ( ≤ 0°). However, a weaker efficiency of pinning related to growth boundaries as well as a wider field range where this dissipation mechanism is active were observed for films grown on CeO 2-buffered sapphire. These films exhibited a broad peak centred at ≤ 0° in the Jc versus angle behaviour, not observed using a SrTiO3 substrate. The analysis of the Jc(H) dependences collected at ≤ 90° revealed that this feature can be partially ascribed to a dramatic decrease of the intrinsic pinning efficiency. © IOP Publishing Ltd.
Original languageEnglish
Article number013
Pages (from-to)381 - 385
Number of pages5
JournalSuperconductor Science and Technology
Volume20
Issue number4
DOIs
Publication statusPublished - 1 Apr 2007
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)
  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

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