Electron-phonon coupling constant of cuprate based high temperature superconductors |
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Authors: | R. Abd-Shukor |
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Affiliation: | School of Applied Physics, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia |
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Abstract: | The electron-phonon coupling constant in two-dimensional cuprate high temperature superconductors has been determined by the ultrasonic method. The electron-phonon coupling constant in the Van Hove scenario was found to increase with transition temperature Tc. is in the range of 0.025-0.060 which is 10-100 times smaller than the conventional three-dimensional Bardeen-Cooper-Schrieffer coupling constant. The characteristic Debye temperature θD does not correlate with Tc. These findings show that the interplay between the Debye frequency and electron-phonon coupling in the two-dimensional system and their variations have a combined effect in governing the transition temperature. |
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Keywords: | 63.20.Kr 74.20.Fg 74.25.Ld 74.72.-h |
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