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Title: Lattice and electronic contributions to the refractive index of CuWO₄

Abstract

We report an investigation of the refractive index dispersion and anisotropy in CuWO₄ by means of interference measurements in two extinction directions from mid infrared to the visible region of the energy spectrum. The analysis of the refractive index dispersion yields ϵ(∞)=4.5(1) for light polarization parallel to the c-axis and ϵ(∞)=5.3(1) with respect to the other extinction axis. In addition, we report reflectance measurements carried out from the far infrared to the near ultraviolet to study the lattice and electronic contributions to the refractive index of CuWO₄. We have determined the wavenumbers of nine infrared active lattice modes and compared them with previous ab initio calculations. The value of the Penn gap, 7eV, as well as the origin of a structure observed at 4.4 eV in the reflectance spectrum, is discussed in the context of the CuWO₄ electronic structure.

Authors:
;  [1]; ;  [2]
  1. Malta-Consolider Team, Departamento de Física Aplicada-ICMUV, Universitat de València, Dr. Moliner 50, 46100 Burjassot (Spain)
  2. Malta-Consolider Team Departamento de Física Fundamental II, Instituto de Materiales y Nanotecnología, Universidad de La Laguna, La Laguna, 38205 Tenerife (Spain)
Publication Date:
OSTI Identifier:
22305951
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 116; Journal Issue: 10; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANISOTROPY; COPPER TUNGSTATES; DISPERSIONS; ELECTRONIC STRUCTURE; ENERGY SPECTRA; EV RANGE; INTERFERENCE; POLARIZATION; REFRACTIVE INDEX; ULTRAVIOLET RADIATION; VISIBLE RADIATION

Citation Formats

Ruiz-Fuertes, J., E-mail: ruiz-fuertes@kristall.uni-frankfurt.de, Malta-Consolider Team, Departamento de Física Aplicada-ICMUV, Universitat de València, Dr. Moliner 50, 46100 Burjassot, Pellicer-Porres, J., Segura, A., Rodríguez-Hernández, P., and Muñoz, A. Lattice and electronic contributions to the refractive index of CuWO₄. United States: N. p., 2014. Web. doi:10.1063/1.4895125.
Ruiz-Fuertes, J., E-mail: ruiz-fuertes@kristall.uni-frankfurt.de, Malta-Consolider Team, Departamento de Física Aplicada-ICMUV, Universitat de València, Dr. Moliner 50, 46100 Burjassot, Pellicer-Porres, J., Segura, A., Rodríguez-Hernández, P., & Muñoz, A. Lattice and electronic contributions to the refractive index of CuWO₄. United States. https://doi.org/10.1063/1.4895125
Ruiz-Fuertes, J., E-mail: ruiz-fuertes@kristall.uni-frankfurt.de, Malta-Consolider Team, Departamento de Física Aplicada-ICMUV, Universitat de València, Dr. Moliner 50, 46100 Burjassot, Pellicer-Porres, J., Segura, A., Rodríguez-Hernández, P., and Muñoz, A. 2014. "Lattice and electronic contributions to the refractive index of CuWO₄". United States. https://doi.org/10.1063/1.4895125.
@article{osti_22305951,
title = {Lattice and electronic contributions to the refractive index of CuWO₄},
author = {Ruiz-Fuertes, J., E-mail: ruiz-fuertes@kristall.uni-frankfurt.de and Malta-Consolider Team, Departamento de Física Aplicada-ICMUV, Universitat de València, Dr. Moliner 50, 46100 Burjassot and Pellicer-Porres, J. and Segura, A. and Rodríguez-Hernández, P. and Muñoz, A.},
abstractNote = {We report an investigation of the refractive index dispersion and anisotropy in CuWO₄ by means of interference measurements in two extinction directions from mid infrared to the visible region of the energy spectrum. The analysis of the refractive index dispersion yields ϵ(∞)=4.5(1) for light polarization parallel to the c-axis and ϵ(∞)=5.3(1) with respect to the other extinction axis. In addition, we report reflectance measurements carried out from the far infrared to the near ultraviolet to study the lattice and electronic contributions to the refractive index of CuWO₄. We have determined the wavenumbers of nine infrared active lattice modes and compared them with previous ab initio calculations. The value of the Penn gap, 7eV, as well as the origin of a structure observed at 4.4 eV in the reflectance spectrum, is discussed in the context of the CuWO₄ electronic structure.},
doi = {10.1063/1.4895125},
url = {https://www.osti.gov/biblio/22305951}, journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 10,
volume = 116,
place = {United States},
year = {Sun Sep 14 00:00:00 EDT 2014},
month = {Sun Sep 14 00:00:00 EDT 2014}
}