Abstract
The changes of the conductivity, the Hall coefficient, and the transverse magnetoresistance due to the field effect are measured on thin InSb samples between 78 and 295° K. The conductivity has an anomalous minimum in the electron accumulation region which is caused by a negative surface mobility. The resistivity in the transverse magnetic field (up to 20 kG) shows a minimum, if electrons are accumulated and if the magnetic field is normal to the investigated surface. The two-conductor two-band model explains very well the behavior of the Hall coefficient and the transverse magnetoresistance. The resulting surface mobilities confirm qualitatively the theory of the diffuse surface scattering.
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