Evolution of the metallic state of LaNiO${}_3$/LaAlO${}_3$ superlattices measured by ${}^8$Li $\beta$-detected NMR

Abstract

Using ion-implanted ${}^8$Li $\beta$-detected NMR, we study the evolution of the correlated metallic state of LaNiO${}_3$ in a series of LaNiO${}_3$/LaAlO${}_3$ superlattices as a function of bilayer thickness. Spin-lattice relaxation measurements in an applied field of 6.55 T reveal two equal amplitude components: one with metallic ($T$-linear) $1/T_1$, and a second with a more complex $T$-dependence. The metallic character of the slow relaxing component is only weakly affected by the LaNiO${}_3$ thickness, while the fast component is much more sensitive, exhibiting the opposite temperature dependence (increasing towards low $T$) in the thinnest, most magnetic samples. The origin of this bipartite relaxation is discussed.

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Cited by in corpus (1)

• Depth-resolved measurement of the Meissner screening profile in a niobium thin film from spin-lattice relaxation of the implanted $\beta$-emitter ${}^8$Li