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Phys. Rev. Lett. 101, 227602 (2008) [4 pages]

Charge Order, Dynamics, and Magnetostructural Transition in Multiferroic LuFe2O4

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X. S. Xu1, M. Angst2,3, T. V. Brinzari1, R. P. Hermann3,4, J. L. Musfeldt1, A. D. Christianson2, D. Mandrus2,5, B. C. Sales2, S. McGill6, J.-W. Kim7, and Z. Islam8
1Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, USA
2Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
3Institut für Festkörperforschung, Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany
4Department of Physics, B5, Université de Liège, B-4000 Sart-Tilman, Belgium
5Department of Physics, University of Tennessee, Knoxville, Tennessee 37996, USA
6National High Magnetic Field Laboratory, Tallahassee, Florida, 32310, USA
7Ames Laboratory, Ames, Iowa 50010, USA
8Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA

Received 16 September 2008; published 26 November 2008

We investigated the series of temperature and field-driven transitions in LuFe2O4 by optical and Mössbauer 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.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.101.227602
DOI:
10.1103/PhysRevLett.101.227602
PACS:
76.80.+y, 71.30.+h, 75.30.Kz, 78.20.Ci

See Also

See Also: M. Angst, R. P. Hermann, A. D. Christianson, M. D. Lumsden, C. Lee, M.-H. Whangbo, J.-W. Kim, P. J. Ryan, S. E. Nagler, W. Tian, R. Jin, B. C. Sales, and D. Mandrus, Charge Order in LuFe2O4: Antiferroelectric Ground State and Coupling to Magnetism, Phys. Rev. Lett. 101, 227601 (2008).

 
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