|Title||8Li in GaAs studied with $\beta$-NMR|
|Publication Type||Journal Article|
|Year of Publication||2007|
|Authors||Dunlop, T, Mansour, AI, Salman, Z, Chow, KH, Fan, I, Jung, J, Kiefl, RF, Kreitzman, SR, Levy, CDP, MacFarlane, WA, Morris, GD, Parolin, TJ|
|Pagination||254 - 257|
β -NMR has been used to study isolated spin polarized Li + 8 in bulk crystalline GaAs. At low temperatures a large fraction (at least 70%) of the Li end up in locations with cubic symmetry (e.g. a tetrahedral interstitial site). The linewidth of the β -NMR Li + 8 resonance increases dramatically above 150 K, and reaches a maximum at about 290 K. These results are consistent with a site change from an interstitial to a substitutional beginning at ≈ 150 K . The field dependence of the linewidth at 100 K is also discussed.