Influence of spin dynamics of defects on weak localization in paramagnetic 2D metals

Spin-flip scattering of charge carriers in metals with magnetic defects leads to the low-temperature saturation of the decoherence time, $τ_φ$, of electrons at the value comparable to their spin relaxation time, $τ_s$. In two-dimensional (2D) conductors such a saturation can be lifted by an in-plane magnetic field, $B_\parallel$, which polarizes spins of scatterers without affecting orbital motion of free carriers. Here, we show that in 2D conductors with substantially different values of the g-factors of electrons ($g_e$) and magnetic defects ($g_i$), the decoherence time $τ_φ(B_\parallel)$ (reflected by the curvature of magnetoconductance) displays an anomaly: it first gets shorter, decaying on the scale $B_\parallel\sim \hbar/|g_i-g_e|μ_B τ_s$, before becoming longer at higher values of $B_\parallel$.

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