Enhancement of thermopower in the highTc superconductor YBa2Cu3O7 and related compounds
R Srinivasan V Sankaranarayanan N P Raju S Natarajan U V Varadaraju G V Subba Rao
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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 toTc. 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.
R Srinivasan1 2 V Sankaranarayanan1 2 N P Raju1 2 S Natarajan2 U V Varadaraju2 G V Subba Rao2
Volume 97, 2023
Continuous Article Publishing mode
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