Diffusion of off-center impurities in a double-well potential

Alex Gordon; Simon Dorfman; David Fuks

doi:10.1016/S0375-9601(02)01053-8

Diffusion of off-center impurities in a double-well potential

Alex Gordon, Simon Dorfman, David Fuks

Department of Mathematics, Physics and Computer Science (Oranim Campus)

Research output: Contribution to journal › Article › peer-review

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.

Original language	English
Pages (from-to)	490-495
Number of pages	6
Journal	Physics Letters, Section A: General, Atomic and Solid State Physics
Volume	301
Issue number	5-6
DOIs	https://doi.org/10.1016/S0375-9601(02)01053-8
State	Published - 2 Sep 2002

Bibliographical note

Funding Information:
We are grateful to the German–Israeli Research Foundation, GIF, No. G-703-41.10/2001 for support. One of us (A.G.) is indebted to P. Wyder for his cooperation in Ref. [17] leading to a part of the results presented here.

ASJC Scopus subject areas

General Physics and Astronomy

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AU - Dorfman, Simon

AU - Fuks, David

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AB - 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.

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Diffusion of off-center impurities in a double-well potential

Abstract

Bibliographical note

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