Applied Magnetic Resonance

, Volume 3, Issue 3–4, pp 729–744 | Cite as

Low field63Cu NMR study of indirect nuclear spin-spin coupling in YBa2Cu3O6.9. A new approach to probe strong correlation effects in high-T c superconductors

  • T. Imai
  • C. P. Slichter
  • A. P. Paulikas
  • B. Veal


The authors carried out a low field (6.3 kOe) NMR measurement of the Gaussian component of63Cu nuclear spin-spin relaxation rate 1/T 2G at the planar Cu site in a high-T c superconductor YBa2Cu3O6.9 (T c=92 K). They demonstrate that the results provide quantitative information concerning the static spin susceptibility χ′(q) at non-zero wave vector q. The detailed analysis of the data assuming a model susceptibility peaked at the corner of first Brillouin zone q=Q (Q=(π/a, θ/a),a: lattice constant) shows that χ′(q) satisfies a Curie-Weiss law around q=Q. Stoner enhancement over the calculated Lindhard function at q=Q is estimated to be of the order of ∼10–20. They also demonstrate that combined analysis of 1/T 1 and 1/T 2G allows one to judge whether anomalous shift of the low frequency spectral weight of χ″(Q,ω) to higher frequencies (i.e.pseudo gap) exists or not. Application of the method to YBa2Cu3O6.9 revealed no appreciable pseudo gap in the material.


Random Phase Approximation Spectral Weight Knight Shift Static Spin Susceptibility Anomalous Shift 
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Copyright information

© Springer 1992

Authors and Affiliations

  • T. Imai
    • 1
    • 2
  • C. P. Slichter
    • 1
    • 2
    • 3
    • 4
  • A. P. Paulikas
    • 5
  • B. Veal
    • 1
  1. 1.Science and Technology Center for SuperconductivityUniversity of Illinois at Urbana-ChampaignUrbanaUSA
  2. 2.Department of PhysicsUniversity of Illinois at Urbana-ChampaignUrbanaUSA
  3. 3.Department of ChemistryUniversity of Illinois at Urbana-ChampaignUrbanaUSA
  4. 4.Materials Research LaboratoryUniversity of Illinois at Urbana-ChampaignUrbanaUSA
  5. 5.Materials Science Division Argonne National LaboratoryArgonneUSA

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