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Measurements of the Composite Fermion masses from the spin polarization of 2-D electrons in the region 1<ν<2
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Measurements of the Composite Fermion masses from the spin polarization of 2-D electrons in the region 1<ν<2
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Measurements of the reflectivity of a 2-D electron gas are used to deduce the polarization of the Composite Fermion hole system formed for Landau level occupancies in the regime 1<\nu<2. The measurements are consistent with the formation of a mixed spin CF system and allow the density of states or `polarization' effective mass of the CF holes to be determined. The mass values at \nu=3/2 are found to be ~1.9m_{e} for electron densities of 4.4 x 10^{11} cm^{-2}, which is significantly larger than those found from measurements of the energy gaps at finite values of effective magnetic field.
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