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We report the local magnetic response of an electron-doped cupratesuperconductor, Pr$_{0.89}$LaCe$_{0.11}$CuO$_{4}$ ($T_c\simeq26$ K), studied bymuon spin rotation (\msr) over a field range from 200 Oe to 50 kOe. In theparamagnetic state, the muon Knight shift along the crystal c-axis ($K_\mu^z$)is proportional to the in-plane susceptibility $\chi_{ab}$. More surprisingly,$K_\mu^z$ is strongly enhanced by the occurrence of superconductivity (below$\sim$40 kOe), changing its sign from positive to negative around $\sim1$ kOewith increasing field. This finding can be understood by considering the weakpolarization of Pr ions due to superexchange interaction with theantiferromagnetic Cu sublattice, which coexists with superconductivity.Comment: 4 pages, 4figures, submitted to J. Phys. Soc. Jp

Strong Correlation Between Field-induced Magnetism and Superconductivity in Pr0.89LaCe0.11CuO4

Strong Correlation Between Field-induced Magnetism and Superconductivity in Pr_0.89LaCe_0.11CuO₄