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We have found the 1/8 anomaly, namely, the anomalous suppression ofsuperconductivity at p (the hole concentration per Cu) = 1/8 in theexcess-oxygen-doped La_1.8_Nd_0.2_Cu_1-y_Zn_y_O_4+\delta_, where the excessoxygen is doped by the electrochemical technique and the phase separation ofthe excess oxygen is suppressed. The 1/8 anomaly has become marked by the 1 %substitution of Zn for Cu. The muon-spin-relaxation measurements have revealedthat the magnetic correlation develops at low temperatures below about 50 K inboth Zn-free and 1 % Zn-substituted samples with p = 1/8. Clear precession ofmuon spins suggesting the formation of a long-range magnetic order has beenobserved below 1 K in the 1 % Zn-substituted sample with p = 1/8. These resultsare consistent with the stripe-pinning model.Comment: 8 pages, 10 figures, to be published in Phys. Rev.

physical review. b, condensed matter

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18anomaly in the excess-oxygen-dopedLa1.8Nd…