1/8 anomaly in the excess-oxygen-doped La1.8Nd0.2Cu1-yZnyO4+δ_
H. Mikuni, T. Adachi, S. Yairi, M. Kato, Y. Koike, I. Watanabe, K. Nagamine
Abstract
We have found the 1/8 anomaly, namely, the anomalous suppression of superconductivity at p (the hole concentration per Cu) = 1/8 in the excess-oxygen-doped La1.8Nd0.2Cu1-yZnyO4+δ, where the excess oxygen is doped by the electrochemical technique and the phase separation of the 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 revealed that the magnetic correlation develops at low temperatures below about 50 K in both Zn-free and 1 % Zn-substituted samples with p = 1/8. Clear precession of muon spins suggesting the formation of a long-range magnetic order has been observed below 1 K in the 1 % Zn-substituted sample with p = 1/8. These results are consistent with the stripe-pinning model.
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