Investigations of YBa2(Cu1–<i>x</i>Fe<i>x</i>)3O7–<i>δ</i> oxide system in strong magnetic fields

The magnetic and superconducting properties of the YBa2(Cu1–xFex)O7–δ (0 ≤ x ≤ 0.12) oxide system are studied in the temperature interval 4.2–100 K. The temperature dependence of the susceptibility in a constant magnetic field up to 130 kOe and the field dependences of magnetization recorded in pulsed fields up to 250 kOe are used to estimate the upper critical field and to determine the critical current density. It is found that the irreversible component of magnetization does not change with increasing iron concentration in compounds with x &amp;gt; 0.06.

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