Magnetic Studies of EuBa₂Cu_{3-x}RuₓO_{7-δ} Compounds

E ects of Ru addition on magnetic properties of EuBa2Cu3−xRuxO7−δ compounds were studied. Samples of EuBa2Cu3−xRuxO7−δ with x from 0.00 to 0.70 were prepared by the solid state reaction technique from Eu2O3, BaCO3, CuO and RuO2 precursors. Temperature dependences of the zeroeld cooled (ZFC) and the eld cooled (FC) DC magnetic moment at low and high applied magnetic eld Ha were measured by the QD SQUID magnetometer MPMS XL-7 and AC magnetization MAC(H) curves at 77 K by the compensation method using the second-order SQUID gradiometer. The molar susceptibility χ of the samples was corrected to the e ects of the sample holder and diamagnetism and χ∗ also was corrected to the temperature independent paramagnetic/diamagnetic contribution χ and tted by the Curie Weiss relation. The values of the Weiss temperature and the e ective magnetic moment have been estimated at low and high value of applied magnetic eld.