Neutron Scattering Investigation of Static Critical Phenomena in the Two-Dimensional Antiferromagnets:Rb2CocMg1-cF4

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  • Neutron Scattering Investigation of Static Critical Phenomena in the Two-Dimensional Antiferromagnets: Rb<SUB>2</SUB>Co<I><SUB>c</SUB></I>Mg<SUB>1−<I>c</I></SUB>F<SUB>4</SUB>
  • Neutron Scattering Investigation of Sta
  • Neutron Scattering Investigation of Static Critical Phenomena in the Two-Dimensional Antiferromagnets: Rb<sub>2</sub>Co<sub><i>c</i></sub>Mg<sub>1-<i>c</i></sub>F<sub>4</sub>

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We have studied the critical behavior of the two-dimensional site-random antiferromagnet Rb2CocMg1−cF4 using neutron elastic and quasi-elastic scattering techniques. The variation with temperature of the intensity of the magnetic Bragg reflections shows a considerable rounding of the transition. Assuming a Gaussian distribution of transition temperature, we have determined the average Néel temperature ⟨TN⟩ and the degree of distribution of Néel temperature σ, and the critical exponent β in a series of compounds with c=1.0, 0.98, 0.97, 0.95, 0.89 and 0.82. The experimental data have been analysed to give the inverse correlation length and the susceptibility in the compounds with c=1.0, 0.97 and 0.89 using the determined values of ⟨TN⟩ and σ. The resulting values of the critical exponents β, ν, γ and η are found to coincide with the exact theoretical values for the two-dimensional Ising model within the experimental errors, and are independent of the concentration of nonmagnetic impurities.

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