Ellipsometric Study of Anisotropy Permittivity of Hexagonal Manganites RMnO3 (R = Ho, Tm, Yb)

A.A. Makhnev; L.V. Nomerovannaya; Natalia N. Loshkareva; A.M. Balbashov

doi:10.4028/www.scientific.net/SSP.190.273

Paper Titles

Spectrum of the Coupled Waves in Magnetics Having the Ferromagnetic Spiral
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Magnetic Properties of Nd_0.6Dy_0.4Fe₃(Bo₃)₄
p.261

The Influence of Magnetoelectric Interactions on the Domain Walls in Multiferroics
p.265

Coupled R and Fe Magnetic Excitations in RFe₃(Bo₃)₄ Multiferroics
p.269

Ellipsometric Study of Anisotropy Permittivity of Hexagonal Manganites RMnO₃ (R = Ho, Tm, Yb)
p.273

Charge Density and Density Waves in Vicinity of the Phase Transition to an Incommensurate Magnetic Structure in RMn₂O₅ Oxides
p.277

Bending Modes and Magnetoelectric Effects in Asymmetric Ferromagnetic-Ferroelectric Structure
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Spatially Modulated Antiferromagnetic Structures in Multiferroic with Biaxial Anisotropy
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Importance of Thermally Induced Magnetic Excitations in First-Principles Simulations of Elastic Properties of Transition Metal Alloys
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Ellipsometric Study of Anisotropy Permittivity of Hexagonal Manganites RMnO₃ (R = Ho, Tm, Yb)

Abstract:

The optical properties of single crystals of the hexagonal manganites RMnO₃ (R = Ho, Tm, Yb) have been investigated by spectroscopic ellipsometry in the spectral range 0.6-5.0 eV. The measurements show a strong anisotropy of the diagonal elements of the dielectric tensor. It has been demonstrated that the optical absorption edge for the polarization Ec was determined by the intense band of O(2p)Mn (3d) transition centered near 1.6 eV, whereas this band for the polarization Ec was strongly suppressed and shifted toward higher energies by 0.15-0.20 eV. The spectral dependences of the ε₁(E) and ε₂(E) for HoMnO₃, TmMnO₃and YbMnO₃single crystals were qualitatively similar. The broad absorption band at E<1.0 eV clearly appears at the energies below the fundamental absorption edge of all of study compounds. It is possible, the origin of the near-infrared ε₂(E) absorption is associated with 4f-4f transitions of R³⁺ ions.

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Solid State Phenomena (Volume 190)

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273-276

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https://doi.org/10.4028/www.scientific.net/SSP.190.273

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June 2012

Authors:

A.A. Makhnev, L.V. Nomerovannaya, Natalia N. Loshkareva, A.M. Balbashov

Keywords:

Anisotropy, Dielectric Function, Electronic Structure, Hexagonal Manganites, Multiferroic, Spectroscopic Ellipsometry

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