Magnetic excitations and optical transitions in the multiferroic spin-i system LiCu2O2

D. Huvonen; U. Nagel; T. RoomY. J. ChoiC. L. ZhangS. ParkS.-W. Cheong

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Magnetic excitations and optical transitions in the multiferroic spin-i system LiCu2O2

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Magnetic excitations in a cycloidal magnet LiCu_2O_2are explored using terahertz absorption spectroscopy inmagnetic fields up to 12 T. Below the spin ordering temperature, eight optically active transitions are observedin the spin system of LiCu_2O_2in the range from 4 to 30 cm-1. In magnetic field number of modesincreases and the electric polarization flop is seen as a change in magnetic field dependence of mode energies.The polarization dependence of two of the modes in zero magnetic field fits the selection rules for the cycloidtilted by θ=(41 1)° from the bc plane. For the remaining six modes electric and magnetic dipole approxi-mations cannot explain the observed polarization dependence. The electromagnon is not seen in the exploredenergy range although there is evidence that it could exist below 4 cm-1.

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《Physical review, B. Condensed matter and materials physics》 |2009年第10期|100402:1-100402:4|共4页
作者
D. Huvonen; U. Nagel; T. RoomY. J. ChoiC. L. ZhangS. ParkS.-W. Cheong;
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作者单位

National Institute of Chemical Physics and Biophysics, Akadeemia tee 23, 12618 Tallinn, Estonia;

Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University,Piscataway, New Jersey 08854, USA;

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正文语种英语
中图分类物理学;
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LiCu2O2; magnetic; exploredenergy range;

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Magnetic excitations and optical transitions in the multiferroic spin-i system LiCu2O2

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