Neutron-scattering study of spin fluctuations in superconducting YBa2Cu3O6+x (x=0.40, 0.45, 0,50)

H. Chou, J.M. Tranquada, G. Shirane, T.E. Mason, W.J.L. Buyers, S. Shamoto, M. Sato

    Research output: Contribution to journalJournal articleResearch


    We show by inelastic neutron scattering that dynamic spin correlations coexist with superconductivity in YBa2Cu3O6+x (x = 0.4,0.45,0.5). For the x = 0.5, T(c) = 50 K sample, the inelastic magnetic intensity at DELTA-E = 6 meV does not show any change near T(c) and is approximately constant from 250 to 10 K, in contrast to earlier data on superconducting La1.85Sr0.15CuO4 (T(c) = 35 K) which showed a decrease of the integrated intensity at a temperature well above T(c). The inelastic magnetic cross section observed here can be consistently modeled as two-dimensional spin waves overdamped by short correlation lengths. The correlation length in the x = 0.5 sample is an order of magnitude smaller than in the x = 0.40 and x = 0.45 samples, indicating a drastic disruption of planar copper spin-spin correlation upon hole doping. The present results are compared with recent NMR studies of T(c) = 60 K material.
    Original languageEnglish
    JournalPhysical Review B
    Issue number7
    Pages (from-to)5554-5563
    Publication statusPublished - 1991


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