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High temperature transport properties of the high Tc superconductor, Y1Ba2Cu3Ox

Published online by Cambridge University Press:  31 January 2011

Han-Ill Yoo
Han-Ill Yoo
Affiliation:
Department of Inorganic Materials Engineering, Seoul National University, Seoul 151-742, Korea
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Abstract

The electrical conductivity and thermopower of the cuprate, Y1Ba2Cu3Ox, have been measured as functions of temperature and oxygen partial pressure over the ranges of 400 °C–700 °C and 10−4 atm—1 atm, respectively. It has been confirmed that, as temperature increases, conduction mechanism changes from metallic to p-type to n-type semiconducting. It has been found that the p-n transition occurs at a specific value for oxygen content (x = 6.35) irrespective of temperature and that the thermopower in the p-type region is insensitive to temperature. The latter leads to a charge transfer mechanism of correlated hopping of holes. Mechanisms of hole generation due to oxygen nonstoichiometry are found to be different in the tetragonal and the orthorhombic phase of the cuprate.

Type
Articles
Information
Journal of Materials Research , Volume 4 , Issue 1 , February 1989 , pp. 23 - 27
Copyright
Copyright © Materials Research Society 1989

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References

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