Abstract
High-resolution measurements of the sound velocity in 20 crystals of bcc3He at constant molar volume (24.1 cm3/mole) show a monotonic decrease of about 0.1% for longitudinal and 0.3% for transverse velocities for a temperature increase from 0.123 to 0.800 K, the change being approximately proportional toT 4. A low-lying transverse mode of 102 m/sec was observed for the first time. The orientation of three samples could be inferred from their absolute velocity, and the temperature dependence of all three elastic constants was calculated. The change in adiabatic bulk modulus is in good agreement with the Mie-Grüneisen equation of state. No effect from the exchange interaction on the velocities could be observed.
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This work was supported by the National Science Foundation.
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Wanner, R., Mueller, K.H. & Fairbank, H.A. Temperature dependence of the sound velocities and elastic constants of bcc3He. J Low Temp Phys 13, 153–173 (1973). https://doi.org/10.1007/BF00654403
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DOI: https://doi.org/10.1007/BF00654403