This article is cited in 5 papers

Magnetism

Anisotropy of permittivity of the hexagonal multiferroic HoMnO$_3$ in the spectral range 0.6–5.0 eV

A. A. Makhnev^a, L. V. Nomerovannaya^a, A. M. Balbashov<sup>b

a</sup> Institute of Metal Physics, Ural Branch of the Russian Academy of Sciences, Ekaterinburg
^b Moscow Power Engineering Institute

Abstract: The anisotropy of the optical properties of a single crystal of the hexagonal manganite HoMnO$_3$ has been investigated by spectroscopic ellipsometry in the spectral range 0.6–5.0 eV. It has been demonstrated that the optical absorption edge for the polarization $\mathbf{E}\perp c$ is determined by the intense narrow transition O(2$p$) $\to$ Mn(3$d$) centered at 1.5 eV, whereas this transition for the polarization $\mathbf{E}\parallel c$ is strongly suppressed and shifted toward higher energies by 0.2 eV. It has been revealed that, at the temperature $T$ = 293 K, the spectra for both polarizations $\mathbf{E}\parallel c$ and $\mathbf{E}\perp c$ exhibit a broad absorption band centered at $\sim$2.4 eV, which was earlier observed in nonlinear spectra during optical second harmonic generation.

Received: 22.04.2010

 English version: Physics of the Solid State, 2011, 53:1, 105–108

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