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We report the measurement, at 0. 51 K and up to 28 T, of the magnetoresistance and Hall resistance of a dilute two-dimensional electron system with 610^10 cm^-2 carriers in a GaAs-GaAlAs heterojunction. The existence of an anomalous quantized Hall effect for a fractional Landau-level filling factor of 13 was confirmed. The magnetoresistance showed a substantial deviation from linearity above 18 T and exhibited no additional features for filling factors below 15 down to 111. The results suggest that a transition from a quantum liquid to a crystalline state may take place.
Méndez et al. (Sat,) studied this question.