Hall effect in CdGexAs2glasses

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Abstract
Conductivity and Hall effect measurements have been made on a series of CdGe x As2 glasses with x varying from 0.1 to 0.8 and in the temperature range 300–600 K. The Hall mobility at room temperature exhibits a large variation with the germanium content, having a maximum of 0.28 cm2/V sec at x = 0.7, and a minimum of 0012 cm2/V sec at x = 0.33. The temperature dependence of the Hall mobility also shows a significant change with increasing x. For low concentrations, up to x = 0.33, the Hall mobility increases slightly with temperature. For x ≥ 0.5 it is nearly constant up to 400 K, at which temperature it starts to decrease sharply and appears to approach zero at about 570 K. In the case of CdGe0.8As2, for which it was possible to obtain measurements above 570 K, the Hall mobility starts to increase again above this temperature. The sign of the Hall coefficient was negative for all glasses examined at temperatures below 570 K. However, for CdGe0.8As2 the Hall coefficient, while negative up to 570 K, changes sign at this temperature and becomes positive.

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