Quadrupole effects and singularities of NMR of optically oriented nuclei in semiconducting solid solutions
Zakharchenya V.P. , Novikov V.A. , Fleisher V.G.
We have observed resonant transitions of optically oriented nuclei, with frequencies that vary sinusoidally, when the crystal is rotated, between zero and thrice the ordinary NMR frequency. The resonances are due to violation of the cubic symmetry when gallium is replaced by aluminum in the solid solution GaAlAs.