Abstract
The influence of radiation-induced defects on the energy gap Δ in YBa 2Cu 3O 7−δ, as measured with the help of Andreev reflection, was investigated. It was found that Δ decreases with irradiation fluence F increasing at a much lower rate than T c. It is shown that δ remains different from zero for F>F c, where F c is the fluence corresponding to T c=0. The results are interpreted as a transition of a Bose condensate of Cooper pairs into a localized state.
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