Analysis of anomalous Brillouin scattering in K<sub>2</sub>SeO<sub>4</sub>
J J L Horikx; A F M Arts; J I Dijkhuis; H W de Wijn; J J L Horikx; Fac. of Phys. & Astron., Utrecht Univ., Netherlands; A F M Arts; Fac. of Phys. & Astron., Utrecht Univ., Netherlands; J I Dijkhuis; Fac. of Phys. & Astron., Utrecht Univ., Netherlands; H W de Wijn; Fac. of Phys. & Astron., Utrecht Univ., Netherlands
Журнал:
Journal of Physics: Condensed Matter
Дата:
1989-08-21
Аннотация:
An analysis is presented of the anomalous frequency shift and linewidth of Brillouin scattering in K<sub>2</sub>SeO<sub>4</sub> near the normal-incommensurate phase transition at T<sub>i</sub>=130 K. Fluctuations are included up to second order, which allows incorporation of the regime above T<sub>i</sub>. Below T<sub>i</sub>, terms to second order in the fluctuations and a bilinear part in the order parameter and the fluctuations each contribute significantly to the anomalies. Results for relaxation times and coupling parameters are compared with findings from other sources.
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