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Phonon Damping in YBaCuO: Simplicity of a Complex System
Author(s) -
Panfilov A. G.,
Tajima S.,
Yamanaka A.
Publication year - 1999
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/(sici)1521-3951(199909)215:1<501::aid-pssb501>3.0.co;2-7
Subject(s) - phonon , anharmonicity , raman spectroscopy , condensed matter physics , atom (system on chip) , materials science , physics , optics , computer science , embedded system
We report a study of the phonon spectra in YBa 2 Cu 3 O 7— x single crystals with varied oxygen content. We have experimentally investigated the temperature dependence of the widths of phonon Raman lines, including the resonantly enhanced additional ones. Upon comparing our results with those from studies of infrared‐active phonons, we have found that the phonon dampings over whole spectral range and a wide range of temperatures can be described in a framework of a rather simple model despite the intricacy of the phonon anharmonicity phenomenon and the complexity of the multi‐atom unit cell of YBa 2 Cu 3 O 7— x . We attribute such a simplification to the effective averaging of the phonon–phonon interaction, which is both wave‐vector‐ and energy‐dependent due to the large number of phonons involved.