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Thin films of the optimally electron-doped $T'$-phase superconductorLa$_{1.89}$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: forthe whole dilute Co doping range, LCCCO thin films show long-rangeferromagnetic ordering at the temperature range from 5 K to 300 K, which islikely due to the RKKY interaction; in the very dilute Co doping, $x$ = 0.01and 0.02, the superconductivity is maitained, the system shows the coexistenceof superconductivity and ferromagnetism in the CuO$_{2}$ plane. This may bebased on the nature of the charge carriers in electron-doped high-$T_{c}$cuprate superconductors.Comment: 5 pages, 4 figures, accepted for publication in Physical Review

physical review. b, condensed matter and materials physics

Coexistence of superconductivity and ferromagnetism in a dilute cobalt-doped<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">La</mml:mi><mml:mn>1.89</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Ce</mml:mi><mml:mn>0.11</mml:mn></mml:msub><mml:mi mathvariant="normal">Cu</mml:mi><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mrow><mml:mn>4</mml:mn><mml:mo>±</mml:mo><mml:mi>δ</mml:mi></mml:mrow></mml:msub…

Coexistence of superconductivity and ferromagnetism in a dilute cobalt-dopedLa1.89Ce0.11CuO4±δ