Enhancement of thermopower in the highT
c superconductor YBa2Cu3O7 and related compounds |
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| Authors: | R Srinivasan V Sankaranarayanan N P Raju S Natarajan U V Varadaraju G V Subba Rao |
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| Institution: | (1) Department of Physics, Indian Institute of Technology, 600 036 Madras, India;(2) Material Science Research Centre, Indian Institute of Technology, 600 036 Madras, India |
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| Abstract: | The absolute thermopower of single phase YBa2Cu3O7 and Y0.8Er0.2Ba2Cu3O7 has been measured in the range 250 K to the superconducting transition temperature. It is found that these compounds show
a large enhancement of thermopower in the range 150 K down toT
c. This enhancement shows a steep exponential drop as the temperature increases from the transition temperature. The temperature
variation of the enhancement is too steep to be accounted for by electron-phonon or electron-local structural excitation mechanisms. |
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| Keywords: | High temperature superconductors enhancement in thermoelectric power |
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