Abstract
The results of polarized Raman scattering, far-infrared (FIR) absorption, Kramers-Kronig analysis of FIR reflectance, and lattice-dynamical calculations of the perovskitelike compound ${\mathrm{YBaCuFeO}}_{5}$ (space group P4mm) are reported. All 16 Raman- and infrared-active \ensuremath{\Gamma}-point phonons (6${\mathit{A}}_{1}$+2${\mathit{B}}_{1}$+8E) have been identified and assigned to definite atomic vibrations in close comparison with the structurally similar tetragonal ${\mathrm{YBa}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{6}$ system. The appearance of an additional strong Raman line at 576 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$ is discussed in terms of disorder-induced Raman scattering. The normal-mode frequencies are in reasonable agreement with the results of lattice-dynamical calculations in the framework of a shell model with parameters extracted from several metallic oxides and perovskite compounds.
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