Revisiting μSR Studies of Ion Dynamics in the Light of Extended Kubo-Toyabe Model

2025/08/08 by Ito, Takashi U., Kadono, Ryosuke
#FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci)

paper · doi:10.48550/arxiv.2508.05968

Abstract

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 Na_xCoO₂ 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 μSR studies on ion diffusion from the viewpoint of classical over-barrier-jump mechanism.

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