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Effects of the Ru addition on the structural and superconducting properties of the Eu-123 system were studied. Samples of the nominal composition EuBa2Cu3-xRuxO7-delta with x ranging from 0.0 to 0.7 were prepared by the solid state reaction technique from Eu2O3, BaCO3, CuO and RuO2 precursors at the temperature of 1050 degrees C for 72 h in flowing oxygen and oxygen-annealed at 580 C for 24 h. X-ray diffraction data show the presence of another Ba-Eu-Ru-O phase, for x >= 0.03, in addition to the main superconducting phase. AC and DC magnetization characteristics were measured by the compensation method using the second-order SQUID gradiometer at approximate to 77 K and the QD SQUID magnetometer MPMS XL-7 at 20 K. The superconducting properties, T-c, Delta T-c, change only weakly up to x = 0.2, and magnetization M(H) deteriorates with an increasing Ru content.

Effects of Ru Addition on the Superconducting Properties of the Eu-123 System