F19 nuclear acoustic resonance in RbMnF3 with K+, Co++, Ni++, Fe++, and Mg++ impurities

Abstract

We report the results of an experimental study of the F19 nuclear-acoustic-resonance spectrum in the antiferromagnetic phase of RbMnF3 doped with small amounts of K+, Co++, Ni++, Fe++, and Mg++ impurities. The results show that the only nuclear spins taking part in this process are those in the immediate vicinity of the impurity ions. Only because of the symmetry-breaking effect of the impurity ions is it possible to couple elastic waves to the F19 nuclear spins. The observed spectra show large qualitative variations depending on the particular type of impurity ion involved. Attempts at achieving a quantitative understanding of the spectra were not successful. © 1973 The American Physical Society.