Thermoelectric power of Tl-Ca-Ba-Cu-O and Pr-Tl-Sr-Ca-Cu-O high Tc superconductors

A. K. Bhatnagar, R. Pan, D. G. Naugle, P. J. Squattrito, A. Clearfield, Z. Z. Sheng, Q. A. Shams, A. M. Hermann

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


The resistance and the thermoelectric power of thallium based high Tc superconductors Tl-Ca-Ba-Cu-O and Pr-Tl-Sr-Ca-Cu-O have been measured in the temperature interval 77-300 K. The resistive behaviour of Tl-Ca-Ba-Cu-O is found to be metallic while that of Pr-Tl-Sr-Ca- Cu-O shows a mixed metallic and semiconductive behaviour. The thermoelectric power of both superconductors is positive throughout the temperature interval. The thermoelectric power of the Tl-Ca-Ba- Cu-O superconductor decreases linearly with increasing temperature above the superconducting transition temperature, Tc, below which it is zero. The thermoelectric power of the Pr-Tl-Sr-Ca-Cu-O sample shows a maximum near 180 K. The temperature dependence of the thermoelectric power of these samples, above Tc, is quite different than that observed for RBa2Cu3O7-x superconductors.

Original languageEnglish
Pages (from-to)53-57
Number of pages5
JournalSolid State Communications
Issue number1
StatePublished - Jan 1990


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