Extended model reveals new insights into spin relaxation and ion diffusion in Na_xCoO_2, suggesting self-diffusion.
The dynamical Kubo-Toyabe (dKT) function is extended to describe the spin relaxation under the coexisting dynamical and static internal magnetic fields. A detailed re-evaluation of the previous μ^±SR data in NaₓCoO₂ using this function disfavors the conventional interpretation based on sodium-ion diffusion and instead supports the μ⁺ self-diffusion scenario. This also resolves the long-standing inconsistencies in the dKT-function-based $μ$SR studies on ion diffusion from the viewpoint of classical over-barrier-jump mechanism.
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Ito et al. (2025) studied this question.
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