Erratum: High resolution β -NMR study of Li + 8 implanted in gold (Physical Review B (2008) 77 (214107) DOI: 10.1103/PhysRevB.77.214107)

The Knight shift of implanted radioactive 8li in metals can easily be measured by-detected NMR in magnetic fields in the Tesla range. However, because such shifts are small, on the order of 100 ppm, the effect of demagnetization is significant and further enhanced by geometry as samples are often in the form of thin films perpendicular to the applied field, yielding the maximum demagnetization factor. The values reported in Table I of the original paper erroneously use the paramagnetic Pauli susceptibility to calculate the demagnetization field. The correct treatment uses the full static uniform magnetic susceptibility. The group-11 metals are well known to be weakly diamagnetic rather than paramagnetic, and the demagnetization field, thus, has the opposite sign. Using the values summarized in Table I, we calculate the additive correction to the shift in a thin film as (Formula Presented) to produce the corrected Table II. In the process, we correct an unrelated typographical error in K for Ag. We have used the originally reported uncertainties, but we note the two resonances in Cu are unresolved, so the uncertainties are likely underestimated. In contrast, the uncertainties in Ag include the effect of a slight systematic temperature dependence [1]. A final caveat is that the Korringa ratio in Au rests on a single value of is significantly less than unity (free electrons), i.e., the relaxation is faster than expected from the shift. The discrepancy is even larger when the measured conduction electron factor is used since is generally considered to be the result of ferromagnetic electron correlations slowing the relaxation, whereas the measured indicates antiferromagnetic correlations, just opposite to the controversial reports of ferromagnetism in nanocrystalline Au. Alternatively, an additional spin-lattice relaxation mechanism may operate at room temperature, effectively shortening in Au are essential. (Table Presented).