Abstract
The physics of random mixtures with competing spin anisotropies is found to be much more complex than ever considered. According to our neutron scattering study of Fe x Co 1- x TiO 3 , orderings of the orthogonal spin components S // and \(\vec{\textbf{\itshape S}}_{\bot}\) seem to be decoupled with each other though not complete; two antiferromagnetic (AF) phases and a mixed ordering phase appear on the concentration vs temperature phase diagram. However, according to our Mossbauer study, S // and \(\vec{S}_{\bot}\) seem to be closely coupled in the AF phases; the boundary between the AF and the mixed ordering phase is not found. This apparently contradictory result is interpreted as follows. In the \(S_{//}(\vec{\textbf{\itshape S}}_{\bot})\) ordered AF phase, orientational distribution of \(\vec{\textbf{\itshape S}}_{\bot}(S_{//})\)'s is such that it does not produce coherent scatterings of neutrons, but each \(\vec{\textbf{\itshape S}}_{\bot}(S_{//})\) stays statically at least in the time scale of th...
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