Possible observation of phase coexistence of the nu=1/3 fractional quantum hall liquid and a solid.
We have measured the magnetoresistance of a very low density and extremely high quality two-dimensional hole system. With increasing magnetic field applied perpendicularly to the sample we observe the sequence of insulating, nu=1/3 fractional quantum Hall liquid, and insulating phases. In both of the insulating phases in the vicinity of the nu=1/3 filling the magnetoresistance has an unexpected oscillatory behavior with the magnetic field. These oscillations are not of the Shubnikov-de Haas type and cannot be explained by spin effects. They are most likely the consequence of the formation of a new electronic phase which is intermediate between the correlated Hall liquid and a disorder pinned solid.
Csáthy
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GA
Department of Electrical Engineering, Princeton University, Princeton, NJ 08544, USA.
Tsui
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DC
Pfeiffer
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LN
West
K W
KW