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Title: Electron-lattice coupling parameters and oscillator strengths of cerium-doped lutetium oxyorthosilicate

Abstract

Optical absorption of single-crystal, cerium-doped lutetium oxyorthosilicate has been carefully measured in the temperature interval 10-300 K. Prominent Gaussian absorption peaks occur at 3.432{+-}0.002 eV (peak a), 3.502{+-}0.002 eV (peak b), 4.236{+-}0.0002 eV (peak c), and 4.746{+-}0.0002 eV (peak d), in excellent agreement with previously reported excitation spectra. The second moments are well described by the usual linear model, yielding the Huang-Rhys parameter (S) and vibrational quantum energies for the individual peaks. All absorption bands are characterized by S>5 indicating strong coupling between the Ce{sup 3+} ion and lattice. Temperature dependence of the band centroids exhibits contrasting behavior that is dominated by higher-order coupling terms in the linear harmonic oscillator model or by crystal-field effects. Oscillator strengths of the 4f{yields}5d transitions are calculated from Smakula's formula and knowledge of the Ce{sup 3+} distribution between the two crystallographically inequivalent sites. Values for peaks b, c, and d range from approximately 0.003 to 0.004, and peak a spans magnitude approximately 0.012 to 0.018. From the known correlation between average Ce{sup 3+}-ion-ligand distance and oscillator strength, we tentatively conclude that peak a is correlated with the seven-oxygen-coordinated site, and peaks b, c, and d are associated with the six-oxygen-coordinated site. These results supportmore » the previously proposed two-activation-center model and identify the centers as the two crystallographically inequivalent substitutional sites. (c) 2000 The American Physical Society.« less

Authors:
 [1];  [1];  [1];  [1];  [1];  [2]
  1. Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
  2. Department of Physics, University of California, Berkeley, California 94720-7300 (United States)
Publication Date:
OSTI Identifier:
20216413
Resource Type:
Journal Article
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 61; Journal Issue: 18; Other Information: PBD: 1 May 2000; Journal ID: ISSN 1098-0121
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CERIUM IONS; LUTETIUM SILICIDES; LUTETIUM OXIDES; HARMONIC OSCILLATOR MODELS; ABSORPTION SPECTRA; OSCILLATOR STRENGTHS; VISIBLE SPECTRA; TEMPERATURE RANGE 0000-0013 K; TEMPERATURE RANGE 0013-0065 K; TEMPERATURE RANGE 0065-0273 K; ELECTRON-PHONON COUPLING; CRYSTAL FIELD; IMPURITIES; EXPERIMENTAL DATA; THEORETICAL DATA

Citation Formats

Cooke, D. W., Bennett, B. L., McClellan, K. J., Roper, J. M., Whittaker, M. T., and Portis, A. M. Electron-lattice coupling parameters and oscillator strengths of cerium-doped lutetium oxyorthosilicate. United States: N. p., 2000. Web. doi:10.1103/PhysRevB.61.11973.
Cooke, D. W., Bennett, B. L., McClellan, K. J., Roper, J. M., Whittaker, M. T., & Portis, A. M. Electron-lattice coupling parameters and oscillator strengths of cerium-doped lutetium oxyorthosilicate. United States. doi:10.1103/PhysRevB.61.11973.
Cooke, D. W., Bennett, B. L., McClellan, K. J., Roper, J. M., Whittaker, M. T., and Portis, A. M. Mon . "Electron-lattice coupling parameters and oscillator strengths of cerium-doped lutetium oxyorthosilicate". United States. doi:10.1103/PhysRevB.61.11973.
@article{osti_20216413,
title = {Electron-lattice coupling parameters and oscillator strengths of cerium-doped lutetium oxyorthosilicate},
author = {Cooke, D. W. and Bennett, B. L. and McClellan, K. J. and Roper, J. M. and Whittaker, M. T. and Portis, A. M.},
abstractNote = {Optical absorption of single-crystal, cerium-doped lutetium oxyorthosilicate has been carefully measured in the temperature interval 10-300 K. Prominent Gaussian absorption peaks occur at 3.432{+-}0.002 eV (peak a), 3.502{+-}0.002 eV (peak b), 4.236{+-}0.0002 eV (peak c), and 4.746{+-}0.0002 eV (peak d), in excellent agreement with previously reported excitation spectra. The second moments are well described by the usual linear model, yielding the Huang-Rhys parameter (S) and vibrational quantum energies for the individual peaks. All absorption bands are characterized by S>5 indicating strong coupling between the Ce{sup 3+} ion and lattice. Temperature dependence of the band centroids exhibits contrasting behavior that is dominated by higher-order coupling terms in the linear harmonic oscillator model or by crystal-field effects. Oscillator strengths of the 4f{yields}5d transitions are calculated from Smakula's formula and knowledge of the Ce{sup 3+} distribution between the two crystallographically inequivalent sites. Values for peaks b, c, and d range from approximately 0.003 to 0.004, and peak a spans magnitude approximately 0.012 to 0.018. From the known correlation between average Ce{sup 3+}-ion-ligand distance and oscillator strength, we tentatively conclude that peak a is correlated with the seven-oxygen-coordinated site, and peaks b, c, and d are associated with the six-oxygen-coordinated site. These results support the previously proposed two-activation-center model and identify the centers as the two crystallographically inequivalent substitutional sites. (c) 2000 The American Physical Society.},
doi = {10.1103/PhysRevB.61.11973},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
issn = {1098-0121},
number = 18,
volume = 61,
place = {United States},
year = {2000},
month = {5}
}