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Oxygen content and inhomogeneity effects on the electrical properties of YBa2Cu3Oy thin films

Published online by Cambridge University Press:  31 January 2011

R. Aguiar ,
F. Sánchez  and
M. Varela
R. Aguiar
Affiliation:
Departament de Física Aplicada i Electrònica, Universitat de Barcelona, Av. Diagonal 647, E-08028 Barcelona, Spain
F. Sánchez
Affiliation:
Departament de Física Aplicada i Electrònica, Universitat de Barcelona, Av. Diagonal 647, E-08028 Barcelona, Spain
M. Varela
Affiliation:
Departament de Física Aplicada i Electrònica, Universitat de Barcelona, Av. Diagonal 647, E-08028 Barcelona, Spain
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Abstract

Oxygen content is a very important factor influencing the electrical properties of YBa2Cu3Oy. In this work the electrical properties of laser deposited YBa2Cu3Oy thin films on LaAlO3(100), in the whole range 6 ≤ y ≤ 7, are studied. An electrical network model, which randomly assigns oxygen contents and R(T) characteristics to the different elements in the circuit according to an arbitrary distribution, is used to analyze several features in the measured R(T) characteristics as a function of oxygen homogeneity. The model takes into account both short-range and long-range oxygen inhomogeneities. Good agreement between estimated oxygen contents from x-ray diffraction data in our samples and the average oxygen contents used to reproduce their R(T) characteristics is found.The model points out that oxygen homogeneity is very important in order to get the best and reproducible properties, and for conduction and superconductivity analysis through the shape or derivatives of R(T) characteristics.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 1 , January 1997 , pp. 47 - 53
Copyright
Copyright © Materials Research Society 1997

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