Incommensurate Charge Order Phase inFe2OBO3due to Geometrical Frustration
Physical Review Letters2007Vol. 99(25), pp. 256402–256402
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Manuel Angst, Raphaël P. Hermann, W. Schweika, Jong‐Woo Kim, Peter G. Khalifah, Hongjun Xiang, Myung‐Hwan Whangbo, Dong‐Hyun Kim, B. C. Sales, David Mandrus
Abstract
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, tau). The incommensurate modulations arise from specific antiphase boundaries with low energy cost due to geometrical charge frustration.
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