Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-05-12
Physics
Condensed Matter
Strongly Correlated Electrons
Physical Review B in press
Scientific paper
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.
Calvani P.
Li Chun-Hong
Nicoletti D.
Nucara A.
Schade Ulrich
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