Anisotropy of Permittivity of the Hexagonal Multiferroic HoMnO3 in the Spectral Range 0.6-5.0 eV

作者：Makhnev A A^*; Nomerovannaya L V; Balbashov A M

来源：Physics of the Solid State, 2011, 53(1): 105-108.

DOI：10.1134/S1063783411010185

The anisotropy of the optical properties of a single crystal of the hexagonal manganite HoMnO3 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 E perpendicular to c is determined by the intense narrow transition O(2p) --> Mn(3d) centered at 1.5 eV, whereas this transition for the polarization E parallel to 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 E parallel to c and E perpendicular to c exhibit a broad absorption band centered at similar to 2.4 eV, which was earlier observed in nonlinear spectra during optical second harmonic generation.

• 出版日期2011-1