Abstract

Using the radioactive acceptor 111In as PAC probe atom, Cd-Cu pairs in Si are observed after the decay of 111In to 111Cd. In the temperature range between 100 K up to the dissociation temperature of the pairs (235 K) an increasing dynamic relaxation of the PAC signal is observed. The relaxation rate is reversible within this temperature range. This observation is discussed in the framework of the model of a local diffusion of the Cu atom over the four tetrahedral interstitial sites next to the substitutional Cd atom.

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