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Dynamic study of the phonon spectra of YBa2Cu3O7−δ superconductor

Mid-IR transmission spectra of YBa 2 Cu 3 O 7− iδ superconductors are measured in the temperature range of R.T. down to 10 K. The significant difference in spectra between the superconducting phase YBa 2 Cu 3 O 7−δ and other phases is found and considered to be intimately related to the superconducting behavior. The effect of the strong electron-phonon coupling on the high-T c superconductivity process is discussed in terms of group theory for phonon selection rules