Abstract
We have investigated the aperiodic oscillatory structure in the magnetoresistance of small n +GaAs stripes of thickness 50 nm, length 10 μm and widths between 0.09 μm and 0.3 μm. The structure has been studied as functions of temperature (> 1.5K) and magnetic field (0 ≦ B ≦ 12T). The rms amplitude of the oscillations is proportional to T − 1 2 in agreement with theoretical predictions. The aperiodic oscillatory is analysed in terms of the Lee-Stone correlation field. The angular dependence of peaks in the transverse magnetoresistance follows a B = B 0/cos(θ+δ) dependence where θ is the angle to the normal of the substrate and δ covers the range −15° < δ < 15° for different peaks. Above 5T we observe Shubnikov-de Haas oscillations in the transverse magnetoresistance for θ = 0°.
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