Abstract
This note reexamines the importance of geometrical effects on the high-field linear magnetoresistance (MR) which has been observed in epitaxial films of n-type PbTe. It concludes that most of the MR, when it becomes large, is due to the end-shorting effect first analyzed by Wick. A simple derivation of Wick’s result is presented for the limiting case when the Hall angle approaches 90°. The new interpretation implies that end effects spread further along the sample length than the idealized theory predicts. This may also be relevant to the quantum Hall-effect regime, where deviations from precisely quantized values have been observed with increasing sample temperature.
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