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Infrared study of the charge-ordered multiferroic LuFe(2)O(4)

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arxiv 1005.2068 v1 pith:RZD4HVMU submitted 2010-05-12 cond-mat.str-el cond-mat.mtrl-sci

F. M. Vitucci , A. Nucara , D. Nicoletti (Univ. Sapienza Rome) , Y. Sun , C. H. Li (Chinese Ac. Sci.) , J. C. Soret (Univ. Tours) , U. Schade (BESSY Berlin) , P. Calvani (Univ. Sapienza Rome) This is my paper
classification cond-mat.str-elcond-mat.mtrl-sci
keywords luferhombohedraltransitionaboveaccordingagreementanalysisaxis
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The reflectivity of a large LuFe(2)O(4) single crystal has been measured with the radiation field either perpendicular or parallel to the c axis of its rhombohedral structure, from 10 to 500K, and from 7 to 16000 cm-1. The transition between the two-dimensional and the three-dimensional charge order at T_(CO) = 320 K is found to change dramatically the phonon spectrum in both polarizations. The number of the observed modes above and below T_(CO), according to a factor-group analysis, is in good agreement with a transition from the rhombohedral space group R{bar 3}m to the monoclinic C2/m. In the sub-THz region a peak becomes evident at low temperature, whose origin is discussed in relation with previous experiments.

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