ALLOY SCATTERING LIMITED LONGITUDINAL RESISTIVITY IN N-TYPE HG0.8CD0.2TE IN THE EXTREME QUANTUM LIMIT - SCREENING EFFECT

A theoretical model has been developed to study the effect of magnetic -field-dependent and anisotropic screenings on the longitudinal resist ivity in n-type Hg0.8Cd0.2Te in the extreme quantum limit at low tempe ratures, taking into consideration different scattering mechanisms, vi z. deformation potential acoustic phonon, ionized impurity, and alloy disorder. Other complexities, such as band nonparabolicity and nonequi partition of phonons, have been included in the calculation. The theor etically obtained values of the resistivity for magnetic-field-depende nt and anisotropic screening have been compared with the classical cas e and also with the experimental results. The agreement with the exper imental results improves when the effect of magnetic-field-dependent s creening is taken into account.