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The angular dependence of the quasielastic magnetic scattering has been measured in MnF₂ in the critical region T>TN. The temperature dependence of the inverse correlation range and the staggered mode susceptibility for both transverse and longitudinal spin fluctuations were observed as a function of incident neutron energy over the range 56<E₀<134 meV. The validity of the quasielastic approximation for this energy region was verified. The data for the longitudinal fluctuations were found to follow simple power laws with the critical exponents ν=0.634±0.02, γ=1.24±0.02. An η fitted to the data closest to TN gave η=0.05±0.02. The transverse fluctuations are not divergent at TN, although for T>TN they can be described by power-law fits taken with respect to a temperature T_⊥≈66^∘K by indices ν_⊥=0.63±0.08, γ_⊥=1.47±0.1. The actual critical temperature is TN=67.458±0.008.
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Schulhof et al. (1970) studied this question.
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