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

Document Type

Article

Date of this Version

2010

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.