Abstract
Consideration of the dynamics of the hopping process for independent point defects in an ionic crystal suggests that the ionic current cannot exhibit any Hall effect, to first order. An extensive series of measurements on silver bromide, which conducts predominantly by means of isolated, highly mobile silver interstitial ions, yielded no observable Hall signals. These measurements limit the ratio of the Hall mobility to the drift mobility of the interstitial ion in AgBr to less than 5% (at high temperatures) and to 10% (at lower temperatures). For the superionic \ensuremath{\alpha}-AgI, however, we find a Hall mobility which is approximately equal to the drift mobility, confirming earlier results of others. We argue that this Hall signal is a result of the strong correlations between the hopping ions, thus reflecting a fundamental qualitative difference between ``normal'' and superionic conductors.
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