Random Anisotropy Effect in Fe_0.65Co_0.35TiO₃

抄録

Random anisotropy effect has been observed in the neutron quasielastic scattering profile from a single crystal of Fe_0.65Co_0.35TiO₃. The effect appears in magnetic diffuse scattering in the large q space. The instantaneous correlation function in small q around q around antiferromagnetic superlattice points is of the Lorentzian squared function of 1⁄(κ²+q²)², where κ is the temperatured dependent inverse correlation length below T_N. Combined with other experimental results, we conclude that the random anisotropy field destroys the magnetic long range order in this mixture of two components with competing anisotropies.