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Thermoelectric power of YBa2Cu3O7−δ superconductive thin films as a function of oxygen contents

Published online by Cambridge University Press:  31 January 2011

Iván A. Cornejo ,
John U. Trefny  and
Baki Yarar
Iván A. Cornejo
Affiliation:
Colorado School of Mines, Golden, Colorado 80401
John U. Trefny
Affiliation:
Colorado School of Mines, Golden, Colorado 80401
Baki Yarar
Affiliation:
Colorado School of Mines, Golden, Colorado 80401
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Abstract

Experimental correlations of thermoelectric power (TEP), oxygen deficiency (δ), and c-lattice constant in YBa2Cu3O7−δ (YBCO) c-oriented, polycrystalline, thin-film, high-temperature oxide superconductors are presented. The TEP values in the normal state were observed to be positive for samples with oxygen deficiencies between 0.08 ≤ δ ≤ 1.00 and negative for 0.00 ≤ δ ≤ 0.08. Furthermore, the TEP magnitudes were highly sensitive to the amount of oxygen and were found to increase with increasing oxygen deficiency, ranging from values of −2 μ V/K to more than two orders of magnitude higher. In addition, relatively temperature-independent TEP values were observed for hole-conductive samples with low oxygen deficiencies (δ ≤ 0.30). The lattice constants (c) of the same samples were measured by XRD. These were found to increase with oxygen deficiency and to correlate systematically with the TEP values. We conclude that TEP is a reliable indicator of the oxygen content in YBCO materials.

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Articles
Information
Journal of Materials Research , Volume 8 , Issue 2 , February 1993 , pp. 255 - 260
Copyright
Copyright © Materials Research Society 1993

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References

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