Strong correlation between field-induced magnetism and superconductivity in Pr${}_{0.89}$LaCe${}_{0.11}$CuO${}_4$

Abstract

We report the local magnetic response of an electron-doped cuprate superconductor, Pr${}_{0.89}$LaCe${}_{0.11}$CuO${}_4$ ($T_c\simeq 26$ K), studied by muon spin rotation (\msr) over a field range from 200 Oe to 50 kOe. In the paramagnetic 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 $\sim 1$ kOe with increasing field. This finding can be understood by considering the weak polarization of Pr ions due to superexchange interaction with the antiferromagnetic Cu sublattice, which coexists with superconductivity.

4 pages, 4figures, submitted to J. Phys. Soc. Jpn

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Cited by in corpus (5)

• Progress and perspectives on the electron-doped cuprates
• Muon spin rotation studies of electronic excitations and magnetism in the vortex cores of superconductors
• Superconductivity and Field-Induced Magnetism in SrFe_1.75Co_0.25As_2
• Spin-glass state of vortices in YBa2Cu3Oy and La2-xSrxCuO4 below the metal-to-insulator crossover
• Field-Induced Uniform Antiferromagnetic Order Associated with Superconductivity in Pr${}_{1-x}$LaCe${}_x$CuO${}_{4-\delta }$