Galvanomagnetic effects of arsenic (25.5 at%)-antimony alloy single crystals

Abstract

Arsenic-antimony alloy single crystals have been grown at the minimum melting point composition (25.5 at%As) where the solidus and liquidus touch on the phase diagram. Measurements have been made between 1.5K and 300K of the twelve components that define the low-field magnetoresistivity tensor and of the orientation dependence of the tensor components rho 11(B1, B2, 0), rho 11(B1, 0, B3) and rho 21(B1, 0, B3). A least-mean-squares fit to the data has been used to obtain the model parameters for a two band, multivalley, ellipsoidal Fermi surface. The alloy model parameters are compared and contrasted with those in arsenic and antimony themselves. Electrons are found to be sited in Fermi surface pockets of tilt -7 degrees and holes in pockets tilted at -34 degrees . The carrier density, somewhat larger than that in antimony, is almost independent of temperature. Carrier mobilities are much smaller than those in the parent elements. The alloy is semimetallic.