Abstract
The magneto-transport properties of two-dimensional electron gas (2DEG) of n-type modulation-doped Cd 1− x Mn x Te/Cd 1− y Mg y Te single quantum wells were investigated under magnetic fields up to 7 T applied perpendicular to the 2D plane at 2 K . The 2D carrier concentration was varied in the range of 1.8– 4.6×10 11 cm −2 . Apart from the quantum behavior in the magneto- and Hall resistance, a positive and successively negative magnetoresistance (MR) appeared at low magnetic fields. This effect was not observed in non-magnetic 2DEG. This peculiar MR is interpreted as caused by the enhanced spin-splitting in magnetic 2DEG. The appearance of the positive and negative MR was more distinct in a sample with lower carrier concentrations. The positive MR was analyzed on the basis of the theoretical model of the quantum correction to the conductivity in the disordered system.
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