1/8 anomaly in the excess-oxygen-doped La_1.8_Nd_0.2_Cu_1-y_Zn_y_O_4+δ_

Details 1/8 anomaly in the excess-oxygen-doped La_1.8_Nd_0.2_Cu_1-y_Zn_y_O_4+δ_ 1/8 anomaly in the excess-oxygen-doped La_1.8_Nd_0.2_Cu_1-y_Zn_y_O_4+δ_

2003-06-12

arxiv.org/abs/cond-mat/0306308v1

Phys. Rev. B 68, 024524 (2003)

Physics

Condensed Matter

Superconductivity

8 pages, 10 figures, to be published in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.68.024524

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 La_1.8_Nd_0.2_Cu_1-y_Zn_y_O_4+\delta_, 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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