Charge order, dynamics, and magneto-structural transition in multiferroic LuFe$_2$O$_4$
ORAL
Abstract
We investigated the series of temperature and field-driven transitions in LuFe$_2$O$_4$ by optical and M\"{o}ssbauer spectroscopies, magnetization, and x-ray scattering in order to understand the interplay between charge, structure, and magnetism in this multiferroic material. We demonstrate that charge fluctuation has an onset well below the charge ordering transition, supporting the ``order by fluctuation'' mechanism for the development of charge order superstructure. Bragg splitting and large magneto optical contrast suggest a low temperature monoclinic distortion that can be driven by both temperature and magnetic field.
*This work is supported by the U.S. Department of Energy
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Authors
X. Xu
University of Tennessee, Knoxville
University of Tennessee
Manuel Angst
Oak Ridge National Laboratory
Tatiana Brinzari
University of Tennessee, Knoxville
Raphael Hermann
Institut f\"ur Festk\"orperforschung, Forschungszentrum J\"ulich GmbH, Universit\'e de Li\'ege
Janice Musfeldt
University of Tennessee, Knoxville
University of Tennessee
Andy Christianson
Oak Ridge National Laboratory
D. G. Mandrus
Oak Ridge National Laboratory
Oak Ridge National Laboratory, University of Tennessee
Materials Science \& Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
Brian C. Sales
Oak Ridge National Laboratory
Materials Science \& Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
