Coexistence of Superconductivity and Ferromagnetism in Dilute Co-doped $La_{1.89} Ce_{0.11} Cu O_{4\pm\d}$ System

Thin films of the optimally electron-doped $T^{'}$ -phase superconductor La $_{1.89}$ Ce $_{0.11}$ CuO $_{4 \pm \d}$ are investigated by dilute Co doping, formed as La $_{1.89}$ Ce $_{0.11}$ (Cu $_{1 - x}$ Co $_{x}$ )O $_{4 \pm \d}$ (LCCCO) with $x$ = 0.01 – 0.05. The following results are obtained for the first time: for the whole dilute Co doping range, LCCCO thin films show long-range ferromagnetic ordering at the temperature range from 5 K to 300 K, which is likely due to the RKKY interaction; in the very dilute Co doping, $x$ = 0.01 and 0.02, the superconductivity is maitained, the system shows the coexistence of superconductivity and ferromagnetism in the CuO $_{2}$ plane. This may be based on the nature of the charge carriers in electron-doped high- $T_{c}$ cuprate superconductors.

Coexistence of Superconductivity and Ferromagnetism in Dilute Co-doped $L a_{1.89} C e_{0.11} C u O_{4 \pm \d}$ System

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Coexistence of Superconductivity and Ferromagnetism in Dilute Co-doped $L a_{1.89} C e_{0.11} C u O_{4 \pm \d}$ System

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Coexistence of Superconductivity and Ferromagnetism in Dilute Co-doped La1.89Ce0.11CuO4±\dLa1.89​Ce0.11​CuO4±\d​ System

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Coexistence of Superconductivity and Ferromagnetism in Dilute Co-doped La1.89Ce0.11CuO4±\dLa1.89​Ce0.11​CuO4±\d​ System

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Coexistence of Superconductivity and Ferromagnetism in Dilute Co-doped $L a_{1.89} C e_{0.11} C u O_{4 \pm \d}$ System

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Coexistence of Superconductivity and Ferromagnetism in Dilute Co-doped $L a_{1.89} C e_{0.11} C u O_{4 \pm \d}$ System

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