The spin-lattice and spin-spin NMR relaxation times T₁ and T₂ of ⁵⁵Mn and ¹³⁹La were measured as a function of temperature in several (LaNa)MnO₃ perovskites, which are ferromagnetic and exhibit metallic conductivity. Exponential dependence was observed for both T₁^-1 and T₂^-1. In the critical region the relaxation rates are further enhanced. The NMR relaxation may be explained by fluctuations of hyperfine fields caused by the hopping of the eg electrons of Mn ions. The spin dynamics is discussed in terms of the half-metal and polaronic models of the manganites.
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Savosta et al. (1999) studied this question.
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