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Effect of a Magnetic Field on Susceptibility of a Two-Dimensional Ferromagnet K2CuF4 Near the Curie Temperature

The magnetic susceptibility χ a in the two-dimensional ferromagnet K 2 CuF 4 has been measured near T c =6.25 K with the magnetic field H applied in the direction parallel to the a -axis in the easy plane. The field and temperature dependences of χ a are determined and the static scaling hypothesis is examined. Above T c , it is found that χ a is described by a scaling function, χ∼ H - λ Ψ( H / t 1/ µ ), where t =| T / T c -1|, λ=0.82 ±0.05 and µ=0.83 ±0.05. The critical exponents of magnetization and susceptibility, β and γ, are estimated as β=0.22 ±0.05 and γ=0.99 ±0.05 from the relations β=(1 -λ)/µ and γ=λ/µ. The susceptibility χ a has a broad peak in an external magnetic field above T c which shifts to higher temperatures as the mannetic field increases. This broad peak corresponds to the appearance of the magnetic-field-induced ferromagnetic state.