Abstract
An unusual decrease in the slope of the upper critical field near Tc0 at a gradual increase in the ion implantation dose has been experimentally observed in narrow bridges formed on the base of thin HTSC YBa2Cu3O7 – x films, while an increase in the defect concentration usually leads to an increase in the local slope of the phase transition line Hc2(T). In addition, it has been found that the temperature dependence of the upper critical field has a positive curvature near Tc0. A possible theoretical interpretation of the results is proposed. It is based on the modified Ginzburg–Landau theory with a nonuniform length of superconducting correlations.
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