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

Abstract

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.

arXiv commentPhysical Review B in press

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Cited by in corpus (3)

• Ferroelectricity from iron valence ordering in rare earth ferrites?
• Phase Stability of Multiferroic GaFeO3 up to 1368 K from In situ Neutron Diffraction
• Probing the Interplay between Quantum Charge Fluctuations and Magnetic Ordering in LuFe2O4