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$\bete$-nmr of Palladium foil

Title$\bete$-nmr of Palladium foil
Publication TypeJournal Article
Year of Publication2006
AuthorsParolin, TJ, Salman, Z, Chakhalian, J, Wang, D, Keeler, TA, Hossain, M, Kiefl, RF, Chow, KH, Morris, GD, Miller, RI, MacFarlane, WA
JournalPhysica B: Condensed Matter
Pagination419 - 422
KeywordsNuclear probes

Beta-detected \{NMR\} ( β -nmr) of low-energy implanted 8Li+ was studied in metallic palladium. The resonance was found to have a large negative shift with respect to the reference signal in the cubic insulator MgO. This shift exhibited significant temperature dependence on cooling below room temperature, approximately proportionate to the temperature-dependent spin susceptibility of pure Pd. Thus it is tentatively attributed to a Knight shift (K) caused by a large negative hyperfine coupling; a phenomenon common in transition metal ions, but not in alkalis. However, the spin-lattice relaxation of 8Li is much slower than expected from the Korringa law for such a large K. We compare results from samples of very different thicknesses: 12.5 μ m foil and a 100 nm thin film.