Abstract
Measurements of the thermal expansion, ultrasonic wave velocity, and ultrasonic attenuation are reported for very dilute Cr-Mn alloy single crystals. The threshold Mn concentration needed to drive the first-order antiferromagnetic transition in Cr to second order is found to be smaller than 0.05 at. % Mn. This result is discussed in terms of recent theories. The critical behavior of the sound velocity and ultrasonic attenuation of Cr+0.1 at. % Mn is well described by a power law near TN but not for the thermal expansion.
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