7 November 2002 Coexistence of superconductivity and weak ferromagnetism in Eu2-xCexRuSr2Cu2O10-δ
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Eu2-xCexRuSr2Cu2O10-δ(Ru-2122) is the first Cu-O based system in which superconductivity (SC) in the CuO2 planes and weak-ferromagnetism (W-FM) in the Ru sublattice coexist. The hole doping in the CuO2 planes, is controlled by appropriate variation of the Ce concentration and/or increasing the oxygen concentration. SC occurs for Ce contents of 0.4-0.8, with the highest TC=35 K for Ce=0.6. Due to the granular nature of the materials the magneto-resistance R(H) below TC is positive and unexpected hysteresis loops are observed. The R(H) curve on decreasing the applied field (Hext) is much smaller than the R(H) curve for increasing (Hext). The width of the loops depends strongly on the weak-link properties. The as-prepared non-SC EuCeRuSr2Cu2O10 (x=1) sample exhibits magnetic irreversibility below Tirr=125 K and orders anti-ferromagnetically (AFM) at TM =165 K. Systematic magnetic studies on Eu2-xCexRuSr2Cu2O10-δ show that TM, Tirr and Msat decrease with x, and the full Ce dependent magnetic-SC phase diagram is presented. A simple model for the SC state is proposed. The interpretation of the magnetic behavior is: (i) the system becomes antiferromagnetically (AFM) ordered at TM; (b) at Tirr < TM, W-FM is induced by the canting of the Ru moments, and (c), at lower temperatures the appropriate samples become SC at TC. The magnetic features are not affected by the SC state, and the two states coexist.
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Israel Felner, Israel Felner, } "Coexistence of superconductivity and weak ferromagnetism in Eu2-xCexRuSr2Cu2O10-δ", Proc. SPIE 4811, Superconducting and Related Oxides: Physics and Nanoengineering V, (7 November 2002); doi: 10.1117/12.466655; https://doi.org/10.1117/12.466655

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