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The Hall coefficient R H of specimens of cadmium mercury telluride, suitably doped with acceptors, appear anomalously n-type at low temperatures (circa 50K and below). This has been shown to correlate with the extent of surface damage and oxidation. A two-layer model has been used to predict the double sign change and anomalous low temperature R H and is in good agreement with the experimental results.
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Mullin et al. (1984) studied this question.
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