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Detailed measurements of the conductance characteristic of a Ti-doped Al/Al oxide/Ag tunnel junction in zero magnetic field are described. The sample system was carefully chosen so that it corresponded to the theoretical model considered by Appelbaum (1967). The results are compared with the theoretical expressions and it is found that they describe the functional form of the behaviour in detail. The asymptotic expression is shown to be inadequate.
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Wyatt et al. (1974) studied this question.
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