Abstract
The magnetic ground state of an electron-doped cuprate superconductor, Pr 1- x LaCe x CuO 4+α-δ ( x =0.11, α≃0.04), has been studied by means of muon spin rotation/relaxation (µSR) over a wide variety of oxygen depletion, 0.03 ≤δ≤0.12. The appearance of a weak random magnetism over the entire crystal volume has been revealed by a slow exponential relaxation. The absence of δ-dependence for random magnetism and a multiplet pattern of the muon Knight shift at higher fields strongly suggest that the random moments are associated with excited Pr 3+ ions under a crystal electric field.
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