Temperature-dependent Raman spectra of Ho Mn 2 O 5 and Tb <mml:mi mathvariant="…
2005; American Physical Society; Volume: 71; Issue: 17 Linguagem: Inglês
10.1103/physrevb.71.172301
ISSN1550-235X
AutoresBoriana Mihailova, M. Gospodinov, B. Güttler, Fei Yen, A. P. Litvinchuk, M. N. Iliev,
Tópico(s)Magnetic and transport properties of perovskites and related materials
ResumoThe polarized Raman spectra of $\mathrm{Ho}{\mathrm{Mn}}_{2}{\mathrm{O}}_{5}$ and $\mathrm{Tb}{\mathrm{Mn}}_{2}{\mathrm{O}}_{5}$ are reported and discussed. Most of the Raman lines corresponding to $\ensuremath{\Gamma}$-point Raman modes $(13{A}_{g}+13{B}_{1g}+11{B}_{2g}+11{B}_{3g})$ have been observed. The temperature dependence of the $\mathrm{Ho}{\mathrm{Mn}}_{2}{\mathrm{O}}_{5}$ spectra provides no evidence for phonon anomalies associated with magnetic and ferroelectric transitions below $50\phantom{\rule{0.3em}{0ex}}\mathrm{K}$.
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