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Condensed Matter > Materials Science
Title: Ion-Implanted $^8$Li Nuclear Magnetic Resonance in Highly Oriented Pyrolytic Graphite
(Submitted on 18 Jan 2023 (v1), last revised 1 Dec 2023 (this version, v4))
Abstract: We report $\beta$-detected nuclear magnetic resonance of ultra-dilute $^{8}$Li$^{+}$ implanted in highly oriented pyrolytic graphite (HOPG). The absence of motional narrowing and diffusional spin-lattice relaxation implies Li$^+$ is not appreciably mobile up to 400 K, in sharp contrast to the highly lithiated stage compounds. However, the relaxation is remarkably fast and persists down to cryogenic temperatures. Ruling out extrinsic paramagnetic impurities and intrinsic ferromagnetism, we conclude the relaxation is due to paramagnetic centers correlated with implantation. While the resulting effects are not consistent with a Kondo impurity, they also differ from free paramagnetic centers, and we suggest that a resonant scattering approach may account for much of the observed phenomenology.
Submission history
From: John Ticknor [view email][v1] Wed, 18 Jan 2023 23:29:54 GMT (398kb,D)
[v2] Mon, 27 Feb 2023 08:51:27 GMT (410kb,D)
[v3] Sun, 12 Nov 2023 05:20:17 GMT (400kb,D)
[v4] Fri, 1 Dec 2023 04:22:53 GMT (400kb,D)
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