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Magnetic excitations and phonons in the spin-chain compound NaCu2O2

MPS-Authors
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Lemmens,  P.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Capogna,  L.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Sofin,  M.
Abteilung Jansen, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Maljuk,  A.
Scientific Facility Crystal Growth (Masahiko Isobe), Max Planck Institute for Solid State Research, Max Planck Society;

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Jansen,  M.
Abteilung Jansen, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Keimer,  B.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Choi, K. Y., Gnezdilov, V. P., Lemmens, P., Capogna, L., Johnson, M. R., Sofin, M., et al. (2006). Magnetic excitations and phonons in the spin-chain compound NaCu2O2. Physical Review B, 73(9): 094409.


Cite as: https://hdl.handle.net/21.11116/0000-000F-02C7-E
Abstract
We report an inelastic light scattering study of single-crystalline
NaCu2O2, a spin-chain compound known to exhibit a phase with helical
magnetic order at low temperatures. Phonon excitations were studied as
a function of temperature and light polarization, and the phonon
frequencies are compared to the results of ab initio lattice dynamical
calculations, which are also reported here. The good agreement between
the observed and calculated modes allows an assignment of the phonon
eigenvectors. Two distinct high-energy two-magnon features as well as a
sharp low-energy one-magnon peak were also observed. These features are
discussed in terms of the magnon modes expected in a helically ordered
state. At high temperatures, the spectral features attributable to
magnetic excitations are replaced by a broad, quasielastic mode due to
overdamped spin excitations.