Angular properties of pure and Ca-substituted YBa2Cu3O7-δ superconducting thin films grown on SrTiO3 and CeO2 buffered Al2O3 substrates

A. Augieri, G. Celentano, L. Ciontea, V. Galluzzi, U. Gambardella, J. Halbritter, T. Petrisor, A. Rufoloni, A. Vannozzi

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Abstract

In this work transport properties of superconducting 10 at.% Ca-substituted YBCO thin films grown on (1 0 0)-SrTiO3single crystal substrate (STO) and superconducting pure and 10 at.% Ca-substituted YBCO thin films grown on CeO2buffered Al2O3substrates (CAO) have been analyzed as a function of the temperature, applied magnetic field and angle between magnetic field direction and the direction normal to the film surfaces. Particularly, the angular analysis provides an easy way to discriminate between isotropic point defects and correlated pinning sites. Despite the intragrain pinning mechanisms remained unaffected by Ca substitution, a detrimental effect on grain boundary properties clearly emerged for 10 at.% Ca concentration. This effect is enhanced in sample grown on CeO2buffered sapphire where a more disturbed grain boundary is expected resulting in an enhancement of the correlated pinning, already observed in pure YBCO films grown on CAO, and in a reduction of the intrinsic pinning efficiency. © 2007 Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)829 - 830
Number of pages2
JournalPhysica C: Superconductivity and its Applications
Volume460-462 II
Issue numberSPEC. ISS.
DOIs
Publication statusPublished - 1 Sep 2007
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

Augieri, A., Celentano, G., Ciontea, L., Galluzzi, V., Gambardella, U., Halbritter, J., ... Vannozzi, A. (2007). Angular properties of pure and Ca-substituted YBa2Cu3O7-δ superconducting thin films grown on SrTiO3 and CeO2 buffered Al2O3 substrates. Physica C: Superconductivity and its Applications, 460-462 II(SPEC. ISS.), 829 - 830. https://doi.org/10.1016/j.physc.2007.04.086