Effects of Europium-Barium Nonstoichiometry in EBCO123 Systems on Transition and Magnetization Properties |
| A. Cigáň, J. Maňka, M. Kopčok, J. Polovková, P. Jurdák and A. Koňakovský
Institute of Measurement Science, Slovak Academy of Sciences, D'ubravská cesta 9, 841 04 Bratislava, Slovakia |
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| Received: 9 07 2007; |
| We studied the effects of Eu-Ba nonstoichiometry in two series of Eu1+xBa2-xCu3O7-δ and Eu1-xBa2+xCu3O7-δ samples on transition, structural, and magnetic properties. The samples with the nominal composition of 0 ≤ x ≤ 0.07 were synthesized by the solid-state reaction method from Eu2O3, BaCO3, and CuO precursors and sintered at 1050°C for 72 h in flowing oxygen. All the samples show the values of critical temperature Tc, volume density ρ, and maximum volume magnetization Mmax higher than 90 K, 6.3 g cm-3 and 104 Am-1, respectively, except for x = 0.07 samples. The Eu-Ba nonstoichiometry in the two series shows different effects on transport, magnetization hystereses, and intergrain properties of the samples. |
| DOI: 10.12693/APhysPolA.113.219 PACS numbers: 74.72.-h, 74.62.Bf, 74.25.Fy, 74.25.Ha |