A quantized Hall plateau of ρxy=3he², accompanied by a minimum in ρₓₓ, was observed at $T<5$ K in magnetotransport of high-mobility, two-dimensional electrons, when the lowest-energy, spin-polarized Landau level is 1/3 filled. The formation of a Wigner solid or charge-density-wave state with triangular symmetry is suggested as a possible explanation.
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Tsui et al. (1982) studied this question.
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