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Spin fluctuations in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CuGeO</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>probed by light scattering
We have measured the temperature dependence of low-frequency Raman spectra in ${\mathrm{CuGeO}}_{3}$, and have observed quasielastic scattering in the (c,c) polarization above the spin-Peierls transition temperature. We attribute this to the fluctuations of the energy density in the spin system. The magnetic specific heat and an inverse of the magnetic …