Diffusion of off-center impurities in a double-well potential Academic Article uri icon

abstract

  • Diffusion by jumps of off-center impurities in a double-well potential is considered in metals. It is shown that successive jumps of the impurity atom caused by the long-range interactions constitute diffusive motion occurring in random manner as transfer of a “defect” resembling a domain wall in ferromagnetic or ferroelectric materials. We consider the conditions of the dominating contribution of the off-center mechanism in the impurity transfer. We show that the crossover from the thermal activated diffusion to Brownian motion may occur at high temperatures, when it is accompanied by the enhancement of the diffusion.

publication date

  • September 2, 2002