Electrical conductivity in n-type InSb as a function of magnetic field at³He temperatures

Abstract

Electrical conductivity measurements on n-type InSb in the temperature range 0.27-4.2 K and in magnetic fields up to 10 kG have been made. The results indicate a strong magnetic field dependence for the conductivity, with an activation energy depending on magnetic field. These results are discussed in the light of the recently proposed wigner transition which is appropriate to the highly compensated samples used in this work. The magnitude of the activation energy and the role of the first excited state of the impurity centre are also briefly considered.