Combined lattice-location-hyperfine-interaction experiments on Hg implanted in Fe

Abstract

The channeling technique has been used to study the lattice location of Hg implanted at 80 keV into Fe. The impurity is found to be almost entirely substitutional at a dose of 5 \ifmmode\times\else\texttimes\fi{} ${10}^{14}$ ions ${\mathrm{cm}}^{\ensuremath{-}2}$. Using implanted sources nuclear magnetic resonance of oriented nuclei (NMR/ON) was observed both for Fe$^{203}\mathrm{Hg}$ and $\mathrm{Fe}^{197}\mathrm{Hg}^{m}$. The Fe$^{203}\mathrm{Hg}$ resonance observed in an external field of 2.1 kG at 216.4(2) MHz gives ${B}_{\mathrm{hf}}(Fe\mathrm{Hg})=\ensuremath{-}838.1(8)$ kG. For $\mathrm{Fe}^{197}\mathrm{Hg}^{m}$ the resonance at 100.9(1) MHz in an applied field of 2.3 kG yields ${B}_{\mathrm{hf}}(Fe\mathrm{Hg})=\ensuremath{-}839.5(8)$ kG. Both experiments were performed at temperatures below 1 K. The values of ${B}_{\mathrm{hf}}(Fe\mathrm{Hg})$ found in the literature are compared with these values. The difference between the results of time-differential perturbed-angular-correlation experiments at room temperature and the result of the present NMR/ON investigation is ascribed to a temperature anomaly. The hyperfine anomaly $\ensuremath{\Delta}(^{197}\mathrm{Hg}^{m}\ensuremath{-}^{203}\mathrm{Hg})=+0.17(14)%$ has been derived. The spin-lattice relaxation times of $^{203}\mathrm{Hg}$ and $^{197}\mathrm{Hg}^{m}$ in iron are ${T}_{1}=61(7)$ sec and ${T}_{1}=190(40)$ sec, respectively, at 20 mK.

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