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Electronic transitions and dielectric function tensor of a YMnO3 single crystal in the NIR-VUV spectral range

Schmidt-Grund, Rüdiger ; Richter, Steffen LU ; Ebbinghaus, Stefan G. ; Lorenz, Michael ; Bundesmann, Carsten and Grundmann, Marius (2014) In RSC Advances 4(63). p.33549-33554
Abstract

We present optical properties in the near-infrared to vacuum-ultraviolet spectral range of hexagonal YMnO3. The high-quality (110)-oriented bulk single crystal was grown by the optical floating zone technique. We have determined the tensor of the dielectric function by means of Mueller matrix ellipsometry in the wide spectral range (0.5-9.15) eV. For the spectral range below 5.4 eV, we present much more precise data compared to previous reports. For higher energies no experimental reports were given previously. The experimental dielectric function of YMnO3 agrees generally with theoretical calculations. We found the well known transitions involving hybridized oxygen-Mn states and Mn-3d states to be spectrally... (More)

We present optical properties in the near-infrared to vacuum-ultraviolet spectral range of hexagonal YMnO3. The high-quality (110)-oriented bulk single crystal was grown by the optical floating zone technique. We have determined the tensor of the dielectric function by means of Mueller matrix ellipsometry in the wide spectral range (0.5-9.15) eV. For the spectral range below 5.4 eV, we present much more precise data compared to previous reports. For higher energies no experimental reports were given previously. The experimental dielectric function of YMnO3 agrees generally with theoretical calculations. We found the well known transitions involving hybridized oxygen-Mn states and Mn-3d states to be spectrally localized with a homogeneous Lorentzian lineshape. At energies above these transitions, we observe pseudo-transparent points where for each of the principal diagonal elements of the dielectric function tensor the imaginary part approaches zero but at different photon energies. These are followed at the onset of the high-absorption spectral range by parabolic direct band-band transitions which have not been reported so far.

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author
; ; ; ; and
publishing date
type
Contribution to journal
publication status
published
in
RSC Advances
volume
4
issue
63
pages
6 pages
publisher
Royal Society of Chemistry
external identifiers
  • scopus:84905739607
ISSN
2046-2069
DOI
10.1039/c4ra05036c
language
English
LU publication?
no
id
c8297d3e-be9f-44a8-af15-339dd5bdbdef
date added to LUP
2022-04-19 14:52:50
date last changed
2022-04-25 16:22:47
@article{c8297d3e-be9f-44a8-af15-339dd5bdbdef,
  abstract     = {{<p>We present optical properties in the near-infrared to vacuum-ultraviolet spectral range of hexagonal YMnO<sub>3</sub>. The high-quality (110)-oriented bulk single crystal was grown by the optical floating zone technique. We have determined the tensor of the dielectric function by means of Mueller matrix ellipsometry in the wide spectral range (0.5-9.15) eV. For the spectral range below 5.4 eV, we present much more precise data compared to previous reports. For higher energies no experimental reports were given previously. The experimental dielectric function of YMnO<sub>3</sub> agrees generally with theoretical calculations. We found the well known transitions involving hybridized oxygen-Mn states and Mn-3d states to be spectrally localized with a homogeneous Lorentzian lineshape. At energies above these transitions, we observe pseudo-transparent points where for each of the principal diagonal elements of the dielectric function tensor the imaginary part approaches zero but at different photon energies. These are followed at the onset of the high-absorption spectral range by parabolic direct band-band transitions which have not been reported so far.</p>}},
  author       = {{Schmidt-Grund, Rüdiger and Richter, Steffen and Ebbinghaus, Stefan G. and Lorenz, Michael and Bundesmann, Carsten and Grundmann, Marius}},
  issn         = {{2046-2069}},
  language     = {{eng}},
  number       = {{63}},
  pages        = {{33549--33554}},
  publisher    = {{Royal Society of Chemistry}},
  series       = {{RSC Advances}},
  title        = {{Electronic transitions and dielectric function tensor of a YMnO<sub>3</sub> single crystal in the NIR-VUV spectral range}},
  url          = {{http://dx.doi.org/10.1039/c4ra05036c}},
  doi          = {{10.1039/c4ra05036c}},
  volume       = {{4}},
  year         = {{2014}},
}