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

Physics – Condensed Matter – Strongly Correlated Electrons

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Accepted for publication in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.75.073405

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.

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