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  • 1
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: We present experimental results on the attenuation and velocity of first sound in a saturated (X = 0.064) 3He-4He mixture. The measurements were performed at very low temperature (3.5 〈T〈 20 mK) with relatively low frequencies (around 1 MHz) at saturated vapor pressure, using a CW technique. Though the results are found to be in qualitative agreement with the theory for acoustic transmission in degenerate mixtures, they are not quantitatively consistent with theory. A phenomenological explanation is offered for this discrepancy. We compare our data with recent measurements at higher temperatures and frequency. We have also performed the measurements in a magnetic field of 9 T. Within our experimental accuracy we cannot detect any systematic difference from the measurements in zero field. This is expected from theory.
    Type of Medium: Electronic Resource
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