Lattice dynamical probe of charge order and antipolar bilayer stacking in LuFe2O4

Authors

X. S. Xu, University of Nebraska-LincolnFollow
J. de Groot, Forschungszentrum Jülich GmbH
Q.-C. Sun, University of Tennessee, Knoxville
B. C. Sales, Oak Ridge National Laboratory
D. Mandrus, Oak Ridge National Laboratory
M. Angst, Forschungszentrum Jülich GmbH
A. P. Litvinchuk, University of Houston
J. L. Musfeldt, University of Tennessee, Knoxville

Date of this Version

2010

Document Type

Article

Citation

PHYSICAL REVIEW B 82, 014304 (2010)

Comments

Used by permission.

Abstract

We investigated the infrared response of LuFe₂O₄ through the series of charge, magnetic, and structural transitions. All vibrational modes couple strongly to the charge order, whereas the LuO zone-folding modes are also sensitive to magnetic order and structural distortion. The dramatic splitting of the LuO₂ layer mode is attributed to charge-rich/poor proximity effects and its temperature dependence reveals the antipolar nature of the W layer pattern.