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Phys. Rev. Lett. 99, 256402 (2007) [4 pages]

Incommensurate Charge Order Phase in Fe2OBO3 due to Geometrical Frustration

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M. Angst1,*, R. P. Hermann2,3, W. Schweika2, J.-W. Kim4, P. Khalifah5,6, H. J. Xiang7, M.-H. Whangbo7, D.-H. Kim1, B. C. Sales1, and D. Mandrus1
1Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
2Institut für Festkörperforschung, Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany
3Department of Physics, B5, Université de Liège, B-4000 Sart-Tilman, Belgium
4Ames Laboratory, Ames, Iowa 50010, USA
5Department of Chemistry, University of Massachusetts, Amherst, Massachusetts 01003, USA
6Department of Chemistry, State University of New York, Stony Brook, New York 11794, USA
7Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695, USA

Received 20 July 2007; published 19 December 2007

The temperature dependence of charge order in Fe2OBO3 was investigated by resistivity and differential scanning calorimetry measurements, Mössbauer spectroscopy, and synchrotron x-ray scattering, revealing an intermediate phase between room temperature and 340 K, characterized by coexisting mobile and immobile carriers, and by incommensurate superstructure modulations with temperature-dependent propagation vector (1/2,0,τ). The incommensurate modulations arise from specific antiphase boundaries with low energy cost due to geometrical charge frustration.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.256402
DOI:
10.1103/PhysRevLett.99.256402
PACS:
71.30.+h, 61.10.Eq, 64.70.Rh, 76.80.+y

*angst@ornl.gov

 
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