Huge Longitudinal Resistance in the Fractional Quantum Hall Effect Regime

S. Kronmueller, W. Dietsche, J. Weis, K. v. Klitzing, W. Wegscheider, M. Bichler

Published 1998-04-27Version 1

The magneto resistance of a narrow single quantum well is spectacularly different from the usual behavior. At filling factors 2/3 and 3/5 we observe large and sharp maxima in the longitudinal resistance instead of the expected minima. The peak value of the resistance exceeds those of the surrounding magnetic field regions by a factor of up to three. The formation of the maxima takes place on very large time scales which suggests a close relation with nuclear spins. We discuss the properties of the observed maxima due to a formation of domains of different electronic states.