Abstract
The authors report molecular beam epitaxy growth of grey tin films on (001)CdTe substrates. The transverse magnetoresistance and Hall effect have been studied. Films thinner than 400 AA are p-type with carrier densities of (1-2)*1019 cm-3; thicker films are n-type with carrier densities as low as 2*1017 cm-3 Shubnikov-de Haas (SDH) oscillations are observed in samples having Hall mobilities >or=104 cm2 V-1 s-1 at low temperatures. Beat patterns are observed in the SDH spectra, which they ascribe to either inhomogeneous doping, arising from the diffusion of Cd and Te from the substrate, or quantisation of the motion in the direction parallel to the film normal. For field directions at 45 degrees and 90 degrees to the film plane normal, clear SDH oscillations are also observed at fields much lower than the expected size effect cut-off field, implying that specular reflection at the film boundaries plays a significant role.
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