Abstract

Anomalous positive or negative magnetoresistance at low temperatures has been observed in germanium, InSb, gray tin, InAs, GaAs, and C.1–7 Some of the more extensive investigations have revealed certain similarities which may be common to the anomalous magnetoresistance in semiconductors: (1) The magnitude of the anomalous magnetoresistance increases with decreasing temperature. (2) For a given semiconductor the anomalous magnetoresistance reaches a maximum for a particular impurity concentration. (3) In some cases the magnetoresistance can be represented as the sum of an ordinary term with quadratic field dependence and an extraordinary term which saturates with increasing field. A negative magnetoresistance was once observed in tellurium,8 but in subsequent investigations, using zone refined specimens, no such anomaly was detected.9 This paper is a progress report of some new features of this anomalous negative magnetoresistance in tellurium.

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