Abstract
In low-dimensional systems dynamical nuclear polarization is a sensitive tool for the study of electron-nuclear interaction. The authors report on Overhauser-shift experiments on the 2DEG of AlxGa1-xAs/GaAs heterostructures. The conduction electron spin resonance has been electrically detected via the associated change of the magnetoresistance Rxx, and dynamical nuclear polarization (the Overhauser effect) has been achieved by saturating the conduction electron spin resonance (CESR). In order to investigate the nuclear spin relaxation the samples were embedded in an RF coil and the temporal decay of the Overhauser shift was followed with and without additional NMR irradiation. Different spin-lattice relaxation times of 69Ga, 71Ga and 75As could be detected and small deviations from a pure Korringa behaviour have been found.
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