1. Terahertz spectroscopy of central and soft phonon modes in LuFe2O4.
- Author
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Li, S. Z., Luo, S. J., Fu, R., Jin, B. B., Wang, K. F., Liu, J.-M., Ding, J. F., and Li, X. G.
- Subjects
TERAHERTZ spectroscopy ,PHONONS ,FERROELECTRICITY ,DIELECTRICS ,SPECTRUM analysis - Abstract
The terahertz dielectric response of LuFe
2 O4 is investigated by terahertz time-domain spectroscopy over a temperature range of 6–290 K. It is revealed that besides the central mode associated with the charge-ordered state, a soft TO1 mode at below ∼240 K is identified indicating the existence of displacing ferroelectricity, in addition to the charge-ordering-induced ferroelectricity at below 320 K. The anomaly of the soft mode at ∼180 K reflects the magnetoelectric correlation between the soft TO1 mode and the spin/charge fluctuations revealed recently. Finally, the magnetic property at below ∼240 K is discussed. [ABSTRACT FROM AUTHOR]- Published
- 2009
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