MAGNETIZATION AND CRITICAL CURRENTS OF ND2-XCEXCUO4-Y SINGLE-CRYSTALS

In this paper the results of magnetization measurements of Nd 2-x CexC uO4-y single crystals for magnetic field oriented parallel or perpendi cular to c-axis direction are presented. Strong anisotropy of magnetiz ation and critical currents was observed. From magnetization hysteresi s loops the dependence of the critical current (Jc) on the magnetic fi eld (H) was evaluated using the Bean formula. For H parallel-to c (Jc( perpendicular-to c)) clear Jc(H) exponential relations are observed. F or H perpendicular-to c (Jc(parallel-to c)) values of the Jc are small er and depend more weakly on the magnetic field. Then anisotropy of th e critical current at low field (congruent-to 2 kOe) is Jc(perpendicul ar-to c)/Jc(parallel-to c) congruent-to 45 and decreases to congruent- to 4 at H = 10 kOe.