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- W2023280160 endingPage "5134" @default.
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- W2023280160 abstract "Quantitative experimental results of the second-sound damping ${D}_{2}$ near the superfluid transition temperature ${T}_{ensuremath{lambda}}(P)$ are presented at several pressures $P$ as a function of the reduced temperature $t=1ensuremath{-}frac{T}{{T}_{ensuremath{lambda}}(P)}$. The data cover the entire pressure range of the transition and are for $2ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}5}ensuremath{lesssim}tensuremath{lesssim}0.1$. Their experimental uncertainty is in the range of 2-4%. The experimental technique used in this work is described in detail. It is based on a tone-burst method and includes a number of novel features such as discrimination against higher harmonics by spectral analysis of the pulses, rectification before signal averaging to avoid the detrimental effect of temperature noise, a careful study of finite-amplitude effects, and quantitative corrections for nonparallelism of the cavity ends. The results are compared with the predictions based on renormalization-group theory and thermal-conductivity measurements above ${T}_{ensuremath{lambda}}$. The intricate pressure dependence of the data, which changes sign near $tensuremath{approx}{10}^{ensuremath{-}3}$, is given rather well by the prediction. However, the details of the temperature dependence of the data at a given pressure disagree with the theory in its present form by deviations somewhat greater than the experimental uncertainty." @default.
- W2023280160 created "2016-06-24" @default.
- W2023280160 creator A5044268173 @default.
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- W2023280160 date "1984-11-01" @default.
- W2023280160 modified "2023-09-27" @default.
- W2023280160 title "Damping of second sound near the superfluid transition ofHe4as a function of pressure" @default.
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- W2023280160 doi "https://doi.org/10.1103/physrevb.30.5116" @default.
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