Observation of three-magnon light scattering in CuGeO_3
G. Els, P.H.M. van Loosdrecht, P. Lemmens, H. Vonberg, G. G\"untherodt, (II. Physikalisches Institut, RWTH-Aachen, Germany), G. S. Uhrig (Institut, f\"ur Theoretische Physik, Universit\"at zu K\"oln, Germany.), O. Fujita, J., Akimitsu (Department of Physics
TL;DR
This paper reports the observation of a novel three-magnon light scattering process in CuGeO_3, revealed through temperature and magnetic field dependent polarized Brillouin spectra, indicating complex magnetic excitations.
Contribution
It introduces the first experimental evidence of three-magnon light scattering in CuGeO_3, expanding understanding of magnetic excitations in this material.
Findings
Observation of a new spectral feature at 18 cm^{-1}
Identification of three-magnon scattering process
Detection of a bound singlet state at 30 cm^{-1}
Abstract
Temperature and magnetic field dependent polarized Brillouin spectra of CuGeO_3 are reported. In addition to a bound singlet state at 30 cm^{-1}, a new feature has been observed at 18 cm^{-1}. This feature is interpreted in terms of a novel three-magnon light scattering process between excited triplet states.
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