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Low-dc-field magnetic-susceptibility measurements are reported for CuMn alloys containing 1.08-and 2.02-at.'/o Mn using a superconducting quantum-interference device. The zero-field cooled initial susceptibility shows a cusplike peak at T~, the transition temperature to a spin-glass state. After field cooling from T & T~( even for 0=2 6), the susceptibility belo~T~is nearly independent of temperature with the constant value of -0. 97X(T~). The high-temperature susceptibility follows a Curie-Weiss law until just above T~; the value of the Curie temperature is very small. Using the theory of Sherrington and Kirkpatrick, the spin-glass order parameter q(T) is extracted from the susceptibility data. A critical index P=1 is obtained assuming a power law for q(T)~(1 -T/T~)&. The results are qualitatively in agreement with the prediction of an Edwards-Anderson-type mean-field theory.

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