Abstract
Measurements have been made of the temperature dependence of the velocity of longitudinal ultrasonic waves in three single crystal specimens of Cu Mn (C=5,10, and 15 at.% Mn). Two types of effects have been studied in the temperature ranges of the susceptibility maxima (T0). (1) Observations of the change in sound velocity at a given temperature under application of a 11 kG transverse magnetic field show positive deviations above T0, negative deviations below T0, with no change in sound velocity at T0, to within experimental uncertainty. (2) Measurements of the temperature dependent sound velocity in zero magnetic field yield a small, broad minimum for the 5 at.% sample, implying the existence of a correspondingly round maximum in the specific heat. No minima were observed for the other samples. These results are compared with those of similar measurements on a Au Fe crystal, for which no zero field minimum was observed, and on three Au Cr polycrystalline specimens, which showed much larger minima near T0.
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