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Magnetic Ground State of Pr 0.89 LaCe 0.11 CuO 4+α-δ with Varied Oxygen Depletion Probed by Muon Spin Relaxation

2003; Physical Society of Japan; Volume: 72; Issue: 11 Linguagem: Inglês

10.1143/jpsj.72.2955

1347-4073

R. Kadono, Kazuki Ohishi, A. Koda, Wataru Higemoto, Kenji Kojima, Shin-ichi Kuroshima, M. Fujita, Kazuyoshi Yamada,

Magnetic and transport properties of perovskites and related materials

The magnetic ground state of an electron-doped cuprate superconductor Pr$_{1-x}$LaCe$_x$CuO$_{4+\alpha-\delta}$ ($x=0.11, \alpha\simeq0.04$) has been studied by means of muon spin rotation/relaxation (\msr) over a wide variety of oxygen depletion, $0.03\le\delta\le0.12$. Appearance of weak random magnetism over entire crystal volume has been revealed by a slow exponential relaxation. The absence of $\delta$-dependence for the random magnetism and the multiplet pattern of muon Knight shift at higher fields strongly suggest that the random moments are associated with excited Pr$^{3+}$ ions under crystal electric field.