Electronic theory for screw dislocation in b.c.c. transition metals

A simple calculation of the Peierls stress and the core energy of the screw dislocation in b.c.c. transition metals is presented. The d-electrons are treated in a tight-binding approximation and Born-Mayer type potentials are used to simulate the repulsive core-core interactions at short distances. Numerical results are compared with experiments as well as the previous calculations based on the empirical pair potentials. (author)