Twin-free YBa2Cu3O7 films on (001) NdGaO3 showing isotropic electrical behaviour


Rector, J.H. and Koster, P. and Peerdeman, F. and Groot, D.G. de and Dam, B. (1997) Twin-free YBa2Cu3O7 films on (001) NdGaO3 showing isotropic electrical behaviour. Journal of Alloys and Compounds, 251 (1-2). pp. 114-117. ISSN 09258388

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Abstract:Investigating the epitaxial nature of YBa2Cu3O7 films on NdGaO3 (001) by Rutherford backscattering (RBS) and X-ray diffraction (XRD) texture measurements we find that the films are almost single crystalline, in the sense that the a, b and c axes are uniquely defined with respect to those of NdGaO3. The crystalline perfection is, however, not reflected in the electrical properties of the films. Although we measure a Tc of 89.7 K, we did not observe the expected anisotropy in the resistivity. We interpret this to be due to Ga diffusion from the substrate into the film, which effectively blocks the chain conductivity.
Item Type:Article
Copyright:© 1997 Elsevier Science
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