Abstract
We show that low-frequency structure in the infrared reflectance of the high-temperature superconductor YBa{sub 2}Cu{sub 3}O{sub 7} results from the electron-phonon interaction. Characteristic antiresonant line shapes are seen in the phonon region of the spectrum and the frequency-dependent scattering rate of the mid-infrared electronic continuum has peaks at 150 cm{sup {minus}1} (19 meV) and at 360 cm{sup {minus}1} (45 meV) in good agreement with phonon density-of-states peaks in neutron time-of-flight spectra that develop in superconducting samples. The interaction between the phonons and the charge carriers can be understood in terms of a charged-phonon model.
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