4.7 Article

Investigations of proximity-induced superconductivity in the topological insulator Bi2Te3 by microRaman spectroscopy

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Summary: The expression for the electron-phonon coupling coefficient (g(k)) is obtained by solving a six order polynomial equation derived from the quantum dynamical many-body theory of the electron and phonon Green's function for high-temperature superconductors (HTS). The analysis using the YBa2Cu3O7-delta cuprate superconductor shows a decrease in g(k) with increasing temperature above 0 K, indicating anisotropy of electron-phonon coupling in HTSs. Furthermore, the derived expression for g(k) is used to evaluate the superconducting gap, showing agreement with the T-c value for YBa2Cu3O7-delta and the reduced gap ratio of HTSs.

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