Abstract
The random mixture of a quasi-two-dimensional magnet of K 2 Cu 1- x Co x F 4 is studied by neutron scattering in the ferromagnetic composition range, 0.2> x >0. K 2 CuF 4 is the XY-like ferromagnet with the distorted K 2 NiF 4 -type structure. The substitution of Ising spins of Co for XY-like spins of Cu by a few percent brings about a rotation of the easy axis. Two critical lines of three-dimensional XY and two-dimensional Ising characters, intersecting at a tetracritical point, are observed as is commonly seen in randomly mixed magnets with orthogonal anisotropies. It was also found that K 2 Cu 1- x Co x F 4 with 0.2> x >0.05 is a model system of the two-dimensional Ising ferromagnet.
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