Journal
APPLIED PHYSICS LETTERS
Volume 99, Issue 14, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3646402
Keywords
binding energy; conduction bands; energy gap; Fermi level; infrared spectra; iron compounds; multiferroics; polarons; thin films; ultraviolet spectra; valence bands; visible spectra; X-ray photoelectron spectra
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Funding
- National Science Foundation [DMR-0644823]
- U.S. Department of Energy, Basic Energy Sciences, Division of Materials Science and Engineering [DE-FG02-01ER45885]
- Wayne State University through a Career Development Chair
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We investigated the electronic properties of FeVO4 films using optical, valence band x-ray photoelectron, and infrared spectroscopies. These studies show that FeVO4 is a direct bandgap system with a 2.7 eV gap with the Fermi level in the middle of the valence band maximum and conduction band minimum. A polaronic excitation is also observed in the middle infrared, indicating the importance of charge-lattice coupling in this multiferroic material. Fits to a model for the optical response of large polarons yield a binding energy of approximately 130 meV. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3646402]
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