Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-04-15
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 4 figures, submitted to PRB for publication as Rapid Communication
Scientific paper
Magnetic excitations in cycloidal magnet LiCu$_2$O$_2$ are explored using THz absorption spectroscopy in magnetic fields up to 12 T. Below the spin ordering temperature we observe eight optically active transitions in the spin system of LiCu$_2$O$_2$ in the energy range from 4 to 30 cm$^{-1}$. In magnetic field the number of modes increases 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 cycloid tilted by $\theta=41\pm1^{\circ}$ from the bc plane. For the remaining six modes electric and magnetic dipole approximations cannot explain the observed polarization dependence. We do not see the electromagnon in the explored energy range although there is evidence that it could exist below 4 cm$^{-1}$.
Cheong Sang-Wook
Choi Youn-Jun
Hüvonen D.
Nagel Uwe
Park Sahnggi
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