Thermoelectric power of Tl-Ca-Ba-Cu-O and Pr-Tl-Sr-Ca-Cu-O high Tc superconductors
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The resistance and the thermoelectric power of thallium based high T c 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, T c , 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 T c , is quite different than that observed for RBa 2 Cu 3 O 7-x superconductors. © 1990.
author list (cited authors)
Bhatnagar, A. K., Pan, R., Naugle, D. G., Squattrito, P. J., Clearfield, A., Sheng, Z. Z., Shams, Q. A., & Hermann, A. M.