Critical currents and lower critical fields in YBa2(Cu1−xFex)3O7−δ

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The influence of Fe substituted for Cu in YBa2Cu3O7−δ on the intra- and intergrain properties has been studied. In the concentration regime 0 ⩽ x ⩽ 0.02 the intragrain critical current density slightly increases with increasing concentration of iron, but for x ⩾ 0.04 it drops significantly. On the contrary, the intergrain critical parameters are gradually degraded with increasing x, for all concentrations of iron. It is, therefore, concluded that the part of iron under the form of impurity phases locates between grains and makes the intergrain transport properties worse.