Abstract
The hysteretic properties of a d = 3 Random Field Ising Model (RFIM) system, Fe 0.6Zn 0.4F 2, were studied, using neutron scattering. If zero-field-cooled to any T below T N , the antiferromagnetic (AF) state remains stable up to the sharp phase transition at T c ( H), for all T and H. If field-cooled (FC) through T c ( H) the Bragg peak width narrows as T or H decreases but remains constant if T or H is then increased. Hence the AF state is stable and the FC one is not, indicating the lower critical dimensionality d l < 3, in accord with all recent theories, which predict d l = 2.
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