M\"ossbauer spectroscopy was used to study the dynamics of Al self-interstitials trapped at ⁵⁷Co impurities. When a single interstitial atom is trapped at the ⁵⁷Co atom, the Debye-Waller factor decreases rapidly by more than a factor 4 in the temperature interval between 13 and 20 K. We try to explain this anomaly by the following model: The ⁵⁷Co atom jumps between six different positions, thereby forming mixed Co-Al dumbbells with changing Al partners.
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Vogl et al. (1976) studied this question.
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