Static magnetism in superconducting stage-4 La2CuO4+y(y = 0.12)

A. T. Savici, Y. Fudamoto, I. M. Gat, M. I. Larkin, Y. J. Uemura, G. M. Luke, K. M. Kojima, Y. S. Lee, M. A. Kastner, R. J. Birgenau

Research output: Contribution to journalConference articlepeer-review

18 Scopus citations

Abstract

Zero-field (ZF) and transverse-field (TF) μSR measurements have been performed on a superconducting La2CuO4+y crystal with y = 0.12 where excess oxygen is intercalated to form a stage-4 structure. Measurements are made on the same single-crystal sample studied in the neutron scattering measurements of Lee et al. [Phys. Rev. B 60 (1999) 3643] who find that both superconductivity and static incommensurate magnetic modulation develop below Tc ∼ TN ∼ 42 K. The amplitude of the muon precession signal observed in ZF-μSR increases progressively below TN and saturates at T → 0 to the value which indicates that a static magnetic field from Cu moments exists in only a part of muon sites corresponding to a magnetic site fraction of VM = 41%. The observed frequency ∼ 3.5 MHz of the precession signal suggests the development of a large (at least 0.4 μB) static Cu moment near the "magnetic" muon sites. Comparing the TF-μSR results with computer simulations, we obtained VM(T → 0) = 42%.

Original languageEnglish
Pages (from-to)338-342
Number of pages5
JournalPhysica B: Physics of Condensed Matter
Volume289-290
DOIs
StatePublished - 2000
Externally publishedYes
Event8th International Conference on Muon Spin Rotation, Relaxation and Resonance (muSR'99) - Les Diablerets, Switzerland
Duration: Aug 30 1999Sep 3 1999

Funding

This work has been supported by NSF-DMR-98-02000 (at Columbia) and NSF-DMR-97-04532 and DMR-98-08941 (at MIT).

Keywords

  • Magnetic site fraction
  • Stripes
  • Superconductivity
  • μSR

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