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Magnetotransport measurements of two-dimensional electron systems in GaAs/AlGaAs heterostructures with a single Ni dot of micron scale have been done in high magnetic fields up to 14T and at low temperatures between 1K and 100mK. We found new resonance-like giant magnetoresistance anomalies in both R xx and R xy . These anomalies mainly originate from an anomalous potential...
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