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Infrared reflectivity of RBa2Cu3O7−δ superconductors: phonon self-energy effects

✍ Scribed by A.P. Litvinchuk; C. Thomsen; M. Cardona

Book ID: 103944922
Publisher: Elsevier Science
Year: 1991
Tongue: English
Weight: 172 KB
Volume: 185-189
Category: Article
ISSN: 0921-4534
DOI: 10.1016/0921-4534(91)91717-i

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✦ Synopsis

Max

-Planck-lnstitut f~r Festk6rperforschung, 7000 Stuttgart 80, Federal Republic of Germany The temperature dependence of the B1u(z) infrared phonon frequencies, linewidths and oscillator strengths is analyzed for RBa~Cu3Or_6 ceramics (R=Er, Tin, Dy, Pr). The values of an electron-phonon coupling constants for the odd infrared-active vibrations were estimated by comparison of the experimental data with strong-coupling theo~ caku. lations. These values (0.01-0.02) are in good agreement with those reported for the fully symmetric Raman-aefive phonons as well as with ab initio calculations. Anomalies in the temperature dependence of infrared-phonon frequencies around the superconducting transition temperature (To), observed by means of re-

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