$\beta$-NMR of Isolated ${}^8$Li${}^{+}$ Implanted into a Thin Copper Film

Abstract

Depth-controlled $\beta$-NMR was used to study highly spin-polarized ${}^8$Li in a Cu film of thickness 100 nm deposited onto a MgO substrate. The positive Knight Shifts and spin relaxation data show that ${}^8$Li occupies two sites at low temperatures, assigned to be the substitutional ($S$) and octahedral ($O$) interstitial sites. Between 50 to 100 K, there is a site change from $O$ to $S$. The temperature dependence of the Knight shifts and spin-lattice relaxation rates at high temperatures, i.e. when all the Li are in the $S$ site, is consistent with the Korringa Law for a simple metal.

Accepted for publication in Phys. Rev. B

References in corpus (1)

• Near-Surface Structural Phase Transition of SrTiO${}_3$ Studied with Zero-Field $\beta$-Detected Nuclear Spin Relaxation and Resonance

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