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An investigation has been made of second sound in mixtures of He 3 -He 4 in the temperature region obtained by demagnetization of a paramagnetic salt. Several concentrations of He 3 were used ranging between 0.0017 percent and 4.3 percent. The velocity of second sound for the mixtures was found to reach a maximum value of about 35 meters/sec just below 1°K and to approach 20 meters/sec near 0.2°K. In addition, essentially no dispersion of second-sound pulses in mixture below 1°K was observed. This is in marked contrast to heat pulses in pure He 4 in this temperature region. Our results show general agreement with the theoretical predictions of Pomeranchuk, provided the effective mass ju of the He 3 atom is allowed to vary from 2.0 m 3 at 0.2°K to 3.6 m 3 at 1.8°K. * Assisted by the U. S. Office of Naval Research.
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