Electronic structure and polaronic excitation in FeVO4

被引：31

作者：

Dixit, A. ^{[1
]}

Chen, P. ^{[2
]}

Lawes, G. ^{[1
]}

Musfeldt, J. L. ^{[2
]}

机构：

[1] Wayne State Univ, Dept Phys & Astron, Detroit, MI 48201 USA

[2] Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA

来源：

APPLIED PHYSICS LETTERS | 2011年 / 99卷 / 14期

基金：

美国国家科学基金会;

关键词：

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;

D O I：

10.1063/1.3646402

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

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]

引用

页数：3

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