The reflectivity of a large LuFe2O4 single crystal has been measured with the radiation field either perpendicular or parallel to the c axis of its rhombohedral structure, from 10 to 500 K, and from 7 to 16 000 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 (3) over barm to the monoclinic C2/m. In the subterahertz region a peak becomes evident at low temperature, whose origin is discussed in relation with previous experiments.

Infrared study of the charge-ordered multiferroic LuFe2O4 / Vitucci, FRANCESCO MARIA; Nucara, Alessandro; Nicoletti, Daniele; Y., Sun; C. H., Li; J. C., Soret; U., Schade; Calvani, Paolo. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 81:19(2010), pp. 195121-1-195121-6. [10.1103/physrevb.81.195121]

Infrared study of the charge-ordered multiferroic LuFe2O4

VITUCCI, FRANCESCO MARIA;NUCARA, Alessandro;NICOLETTI, DANIELE;CALVANI, Paolo
2010

Abstract

The reflectivity of a large LuFe2O4 single crystal has been measured with the radiation field either perpendicular or parallel to the c axis of its rhombohedral structure, from 10 to 500 K, and from 7 to 16 000 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 (3) over barm to the monoclinic C2/m. In the subterahertz region a peak becomes evident at low temperature, whose origin is discussed in relation with previous experiments.
2010
01 Pubblicazione su rivista::01a Articolo in rivista
Infrared study of the charge-ordered multiferroic LuFe2O4 / Vitucci, FRANCESCO MARIA; Nucara, Alessandro; Nicoletti, Daniele; Y., Sun; C. H., Li; J. C., Soret; U., Schade; Calvani, Paolo. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 81:19(2010), pp. 195121-1-195121-6. [10.1103/physrevb.81.195121]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/31791
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