IR-active optical phonons in Pnma-1, Pnma-2 and R3c phases of LaMnO_{3+\delta}

A. V. Bazhenov; A. V. Dubovitskii; I. S. Smirnova; L. S. Uspenskaya; M. Yu. Maksimuk; T. N. Fursova

arxiv: 0704.1402 · v2 · submitted 2007-04-11 · ❄️ cond-mat.str-el

IR-active optical phonons in Pnma-1, Pnma-2 and R3c phases of LaMnO_(3+δ)

I. S. Smirnova , A. V. Bazhenov , T. N. Fursova , A. V. Dubovitskii , L. S. Uspenskaya , M. Yu. Maksimuk This is my paper

classification ❄️ cond-mat.str-el

keywords deltaphononspnma-1pnma-2phaseswereir-activelamno

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Infrared-active phonons in LaMnO_{3+\delta} were studied by means of the reflection and transmission spectroscopy from 50 to 800 cm^{-1} at room temperature. Powder and ceramic samples of the phases of Pnma-2 (\delta=0.02), Pnma-1 (\delta=0.08), and R3c (\delta=0.15) were investigated. Besides, energies of the dipole-active phonons in Pnma-2, Pnma-1 phases were obtained by lattice-dynamics calculations. The transformations of IR-active phonons with the increase of \delta in the sequence of Pnma-2, Pnma-1, R3c are discussed.

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IR-active optical phonons in Pnma-1, Pnma-2 and R3c phases of LaMnO_(3+δ)

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