Galvanomagnetische, thermoelektrische und thermomagnetische Eigenschaften von Wismut-Tellurid für beliebige Magnetfelder

Abstract

The four matrices of the electrical and the energy current densities are derived for bismuth-Telluride in arbitrary magnetic fields on the basis of DRABBLE'S six-ellipsoid-model. The scattering time will be taken anisotropic but not necessarily diagonal in the same system as the mass tensor. The starting point is BOLTZMANN'S transport equation in its region of validity. These four matrices are converted to resistance, absolute thermopower, PELTIER coefficient and electronic part of the heat conductivity for vanishing magnetic field and for magnetic fields parallel to the trigonal and the binary axis of the crystal. Saturation formulas for all directions of the magnetic field are deduced. Four resistance components mesured in dependence of the magnitude of the magnetic field are used to evaluate the band parameters which are different once more from data of DRABBLE and TESTARDI; but they are independent of the magnitude of the magnetic field within the limit of error.