Dynamic critical behavior of disordered 3D Heisenberg ferromagnets

Abstract The influence of a strong disorder on the critical dynamics of an 3D Heisenberg ferromagnet was investigated by high-resolution quasi-elastic neutron scattering. A new disordered-induced dynamical critical behavior was found, characterized by its critical exponent z =2.3. The dynamical scaling function appeared mainly unaffected by disorder but its description led to a new parameterization of the renormalization group theory, as in the case of pure nickel.