Raman and Infrared-Active Phonons in Hexagonal HoMnO$_3$ Single Crystals: Magnetic Ordering Effects

A. P. Litvinchuk; M. N. Iliev; V. N. Popov; M. M. Gospodinov

doi:10.1088/0953-8984/16/6/011

Raman and Infrared-Active Phonons in Hexagonal HoMnO$_3$ Single Crystals: Magnetic Ordering Effects

Strongly Correlated Electrons 2009-11-10 v1 Materials Science

Authors: A. P. Litvinchuk , M. N. Iliev , V. N. Popov , M. M. Gospodinov

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Abstract

Polarized Raman scattering and infrared reflection spectra of hexagonal HoMnO $_3$ single crystals in the temperature range 10-300 K are reported. Group-theoretical analysis is performed and scattering selection rules for the second order scattering processes are presented. Based on the results of lattice dynamics calculations, performed within the shell model, the observed lines in the spectra are assigned to definite lattice vibrations. The magnetic ordering of Mn ions, which occurs below T $_N$ =76 K, is shown to effect both Raman- and infrared-active phonons, which modulate Mn-O-Mn bonds and, consequently, Mn exchange interaction.

Keywords

Raman scattering infrared-active phonons hexagonal HoMnO3 magnetic ordering Mn-O-Mn bonds exchange interaction

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@article{arxiv.cond-mat/0310502,
  title  = {Raman and Infrared-Active Phonons in Hexagonal HoMnO$_3$ Single Crystals: Magnetic Ordering Effects},
  author = {A. P. Litvinchuk and M. N. Iliev and V. N. Popov and M. M. Gospodinov},
  journal= {arXiv preprint arXiv:cond-mat/0310502},
  year   = {2009}
}

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8 pages, 6 figures

Raman and Infrared-Active Phonons in Hexagonal HoMnO$_3$ Single Crystals: Magnetic Ordering Effects

Abstract

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