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)

T. Adachi, Y. Koike, Risdiana, N. Oki, H. Mikuni, I. Watanabe, F. L. Pratt

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2 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)1169-1171
Number of pages3
JournalPhysica C: Superconductivity and its applications
Volume460-462 II
Issue numberSPEC. ISS.
DOIs
Publication statusPublished - 2007 Sep 1

Keywords

  • 1/8 Anomaly
  • Excess-oxygen-doped La-214 system
  • Muon-spin-relaxation
  • Stripe order

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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