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- W2087015861 abstract "Temperature dependence of the two-roton Raman spectrum of superfluid ${}^{4}mathrm{He}$ was measured at pressures of saturated vapor pressure, $9.8ifmmodetimeselsetexttimesfi{}{10}^{4}$ Pa, $4.9ifmmodetimeselsetexttimesfi{}{10}^{5}$ Pa, and $1.96ifmmodetimeselsetexttimesfi{}{10}^{6}$ Pa from the lowest temperature of 0.75 K to temperatures above the ensuremath{lambda} point. The temperature dependence of both the spectral shape and intensity of the two-roton peak has been found to be simulated well by a model, where the temperature effect is simply broadening of the spectrum with small variation of the roton minimum energy. Spectral shape and peak height at elevated temperatures have been found to be reproduced by convolution integrals of the spectrum at the lowest temperature with Lorentzian functions which take into account the temperature broadening effect at each temperature, where also small temperature dependence of the roton minimum energy had to be taken into account in order to fit the spectrum position. The fact verifies that the Raman spectral shape of superfluid ${}^{4}mathrm{He}$ does not change qualitatively at elevated temperatures and also even crossing the ensuremath{lambda} point. By the model analysis, temperature dependence of the roton minimum energy and the roton half width (inverse of the roton lifetime) have been determined at each pressure as a function of temperature. The results have been compared with theories." @default.
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- W2087015861 date "1998-08-01" @default.
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- W2087015861 title "Temperature dependence of the two-roton Raman spectrum of superfluid4He" @default.
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- W2087015861 doi "https://doi.org/10.1103/physrevb.58.3351" @default.
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