ORIENTATION ANALYSIS OF THE ANISOTROPIC GALVANO-MAGNETISM OF SINTERED BI2TE3

A calculational model is proposed to analyze the anisotropic galvanomagnetism of sintered Bi2Te3 on the basis of the orientation distribution function method. The orientation distribution of crystallites in a specimen is expressed by a distribution function of the Eulerian angle that represents the rotation of the crystallites distributed in the specimen. The distribution can be specified by a single rotation parameter because of the uniaxial anisotropy of Bi2Te3. The rotation parameter can be expressed as the angular width of the distribution by introducing the approximation that the distribution function is a Gaussian function of the tilting angle of the c axis with respect to the pressing direction of the specimen. Resistivity and Hall tensors of sintered specimens are calculated by this method to evaluate the angular width of the distribution. Theoretical curves are calculated from the data of a corresponding single crystal by estimating the distribution parameters. The theoretical curves are in reasonable agreement with the observed data.