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Title: Temperature dependence of the electronic transitions in BiFeO{sub 3} thin film studied by spectroscopic ellipsometry

The temperature dependence of the electronic response of BiFeO{sub 3} thin film grown on a SrTiO{sub 3} substrate is investigated using spectroscopic ellipsometry. By analyzing the pseudodielectric function, we identify two d-d crystal field transitions of Fe{sup 3+} ions in the energy region between 1 and 2‚ÄČeV. The d-d transitions show abnormal temperature dependence that cannot be attributed to conventional electron-phonon interactions. The origin of the abnormal temperature dependence is discussed in terms of spin-charge coupling. The temperature dependence of the charge transfer transitions located above 2.5‚ÄČeV is characterized by standard critical point model analysis of the 2nd derivatives of the dielectric function. This analysis provides detailed information of the critical point parameters for charge transfer transitions.
Authors:
;  [1] ;  [2] ;  [3]
  1. Center for Correlated Electron Systems, Institute for Basic Science, Seoul 151-742 (Korea, Republic of)
  2. (Korea, Republic of)
  3. Department of Physics, Hanyang University, Seoul 133-791 (Korea, Republic of)
Publication Date:
OSTI Identifier:
22399389
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 13; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; BISMUTH COMPOUNDS; CRYSTAL FIELD; DIELECTRIC MATERIALS; ELECTRON-PHONON COUPLING; ELLIPSOMETRY; EV RANGE; IRON IONS; IRON OXIDES; PERMITTIVITY; SPIN; STRONTIUM TITANATES; SUBSTRATES; TEMPERATURE DEPENDENCE; THIN FILMS