TY - JOUR
T1 - μSR study of effects of rare-earth moments on the 1/8 anomaly in the excess-oxygen-doped high-Tc cuprates La2-xAxCuO4+δ (A = Eu, Pr)
AU - Adachi, T.
AU - Koike, Y.
AU - Risdiana,
AU - Oki, N.
AU - Mikuni, H.
AU - Watanabe, I.
AU - Pratt, F. L.
N1 - Funding Information:
The authors thank Drs. A. Amato and R. Scheuermann of PSI for their helpful technical support. This study was also supported by the Joint Program of Japan Society for the Promotion of Science and a TORAY Science and Technology Grant.
PY - 2007/9/1
Y1 - 2007/9/1
N2 - In the zero-field muon-spin-relaxation measurements of the excess-oxygen-doped La2-x(Eu, Pr)xCuO4+δ, a muon-spin precession corresponding to the formation of a long-range magnetic order of Cu spins has been observed around δ = 0.0625 (the hole concentration per Cu, p = 2δ = 1/8) in the nonmagnetic-Eu-substituted system and around δ = 0.082 in the Pr-substituted system, respectively, where the superconductivity is slightly suppressed in both systems. In the Pr-substituted system, it appears that p is effectively ∼1/8 in the CuO2 plane around δ = 0.082, owing to the hybridization between Pr 4f and O 2p orbitals. These results are similar to that previously observed in the magnetic-Nd-substituted La1.8Nd0.2CuO4+δ. It is concluded that the 1/8 anomaly and the stripe correlations of spins and holes exist inherently in the excess-oxygen-doped La-214 systems independent of rare-earth moments.
AB - In the zero-field muon-spin-relaxation measurements of the excess-oxygen-doped La2-x(Eu, Pr)xCuO4+δ, a muon-spin precession corresponding to the formation of a long-range magnetic order of Cu spins has been observed around δ = 0.0625 (the hole concentration per Cu, p = 2δ = 1/8) in the nonmagnetic-Eu-substituted system and around δ = 0.082 in the Pr-substituted system, respectively, where the superconductivity is slightly suppressed in both systems. In the Pr-substituted system, it appears that p is effectively ∼1/8 in the CuO2 plane around δ = 0.082, owing to the hybridization between Pr 4f and O 2p orbitals. These results are similar to that previously observed in the magnetic-Nd-substituted La1.8Nd0.2CuO4+δ. It is concluded that the 1/8 anomaly and the stripe correlations of spins and holes exist inherently in the excess-oxygen-doped La-214 systems independent of rare-earth moments.
KW - 1/8 Anomaly
KW - Excess-oxygen-doped La-214 system
KW - Muon-spin-relaxation
KW - Stripe order
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U2 - 10.1016/j.physc.2007.03.301
DO - 10.1016/j.physc.2007.03.301
M3 - Article
AN - SCOPUS:34548168830
SN - 0921-4534
VL - 460-462 II
SP - 1169
EP - 1171
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
IS - SPEC. ISS.
ER -