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Measured diffusion thermopower of a low-disorder two-dimensional hole system in the extreme quantum limit is used to probe the thermal properties of the recently proposed particle-flux composite fermions (CF's). The data are consistent with the CF's exhibiting the integral quantum Hall effect away from filling factor {ν}=1/2. The magnitudes of the thermopower maxima between the fractional quantum Hall states yield an estimate for the CF Landau-level broadening ΓCF, which agrees well with ΓCF deduced from the analysis of the excitation energy gaps for the fractional liquid states.
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Bayot et al. (1995) studied this question.
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