Experimental Study on the Critical Dynamics of the Order-Disorder Transition in Binary Alloys

By the experiments of the relaxation process of the electrical resistivity in Ni 3 Mn alloy its relaxation time was found to become longer as temperature approaches the transition point. It was verified that below the transition temperature thus obtained relaxation time coincides with that previously obtained for the order parameter by Collins and Teh's neutron diffraction experiments. From the results in the wide temperature range the critical index of the linear relaxation time was analyzed to be 1.0. In CuZn alloy the tendency of critical slowing-down was revealed to take place by measuring the similar electrical resistivity relaxation.