Abstract
We report a reflectivity study of thez-polarized TO-phonons of Pr x Y1−x Ba2Cu4O8 and YBa2−y Sr y Cu4O8 alloys in the temperature range 10–300 K. Anomalies of the frequency and linewidth of the plane-oxygen vibration atω∼300 cm−1 due to the opening of the superconducting gap are found to occur upon crossing the superconducting transition temperatureT c . Phonon self-energy effects are strongly dependent onT c , providing evidence for a relative shift of the gap with respect to the energy of phonon.
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On leave from the Institute for Semiconductor Physics, Ukrainian Academy of Sciences, 252650 Kiev-28, Ukraine.
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Litvinchuk, A.P., Thomsen, C., Cardona, M. et al. Superconducting gap in Pr x Y1−x Ba2Cu4O8 and YBa2−y Sr y Cu4O8 probed by infrared phonon self-energies. J Supercond 7, 113–116 (1994). https://doi.org/10.1007/BF00730379
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DOI: https://doi.org/10.1007/BF00730379