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

Abstract

Thin films of the optimally electron-doped $T^{\prime }$-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.

5 pages, 4 figures, accepted for publication in Physical Review B

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Cited by in corpus (4)

• Transport anomalies and quantum criticality in electron-doped cuprate superconductors
• Thickness-induced insufficient oxygen reduction in La(2-x)CexCuO4 thin films
• Sign reversal of the Hall resistance in the mixed-state of La${}_{1.89}$ Ce${}_{0.11}$CuO${}_4$ and La${}_{1.89}$Ce${}_{0.11}$(Cu${}_{0.99}$Co${}_{0.01}$)O${}_4$ thin films
• Skyrmion-vortex hybrid and spin wave solutions in superconducting ferromagnets