Abstract
A theoretical model describing quasicritical behaviour ofthe nuclear magnetic resonance (NMR) relaxation rates1/T1,1/T2 and muonrelaxation rate λfor cubic ferromagnets and antiferromagnets with spin fluctuations is presented.The model extends and generalizes the model of Moriya and explains why theobserved experimental values of the critical exponents are different from thevalues predicted by the theory of critical phenomena. The formulae for therelaxation rates obtained from this model are used for fitting to the experimentalNMR data for YMn2Dx, TbMn2D2 and the muon spin-rotation (μ SR)data for YMn2, YMn2Dx, GdMn2 and Y(Co1−xAlx)2 (ferromagnetic). It is shownthat the dependence of the exchange coupling constant on the wavevector k isimportant for understanding the observed quasicritical effects.
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