Magnetic excitations and optical transitions in the multiferroic spin- 1 2 system LiCu2 O2

D. Hüvonen, U. Nagel, T. Rõõm, Y. J. Choi, C. L. Zhang, S. Park, S. W. Cheong

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Magnetic excitations in a cycloidal magnet LiCu2 O2 are explored using terahertz absorption spectroscopy in magnetic fields up to 12 T. Below the spin ordering temperature, eight optically active transitions are observed in the spin system of LiCu2 O2 in the 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 θ= (41±1) ° from the bc plane. For the remaining six modes electric and magnetic dipole approximations cannot explain the observed polarization dependence. The electromagnon is not seen in the explored energy range although there is evidence that it could exist below 4 cm-1.

Original languageEnglish
Article number100402
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume80
Issue number10
DOIs
Publication statusPublished - 2009 Sep 11

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Optical transitions
optical transition
Magnetic fields
Polarization
magnetic fields
excitation
polarization
cycloids
Terahertz spectroscopy
spin temperature
Absorption spectroscopy
magnetic dipoles
electric dipoles
Magnets
absorption spectroscopy
magnets
energy
approximation
Temperature

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Hüvonen, D. ; Nagel, U. ; Rõõm, T. ; Choi, Y. J. ; Zhang, C. L. ; Park, S. ; Cheong, S. W. / Magnetic excitations and optical transitions in the multiferroic spin- 1 2 system LiCu2 O2. In: Physical Review B - Condensed Matter and Materials Physics. 2009 ; Vol. 80, No. 10.
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Magnetic excitations and optical transitions in the multiferroic spin- 1 2 system LiCu2 O2. / Hüvonen, D.; Nagel, U.; Rõõm, T.; Choi, Y. J.; Zhang, C. L.; Park, S.; Cheong, S. W.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 80, No. 10, 100402, 11.09.2009.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Magnetic excitations and optical transitions in the multiferroic spin- 1 2 system LiCu2 O2

AU - Hüvonen, D.

AU - Nagel, U.

AU - Rõõm, T.

AU - Choi, Y. J.

AU - Zhang, C. L.

AU - Park, S.

AU - Cheong, S. W.

PY - 2009/9/11

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AB - Magnetic excitations in a cycloidal magnet LiCu2 O2 are explored using terahertz absorption spectroscopy in magnetic fields up to 12 T. Below the spin ordering temperature, eight optically active transitions are observed in the spin system of LiCu2 O2 in the 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 θ= (41±1) ° from the bc plane. For the remaining six modes electric and magnetic dipole approximations cannot explain the observed polarization dependence. The electromagnon is not seen in the explored energy range although there is evidence that it could exist below 4 cm-1.

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