Dynamic stripes and resonance in the superconducting and normal phases of YBa2Cu3O6.5 ortho-II superconductor

C. Stock, W. J. L. Buyers, R. Liang, D. Peets, Z. Tun, D. Bonn, W. N. Hardy, and R. J. Birgeneau
Phys. Rev. B 69, 014502 – Published 13 January 2004
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Abstract

We describe the relation between spin fluctuations and superconductivity in a highly ordered sample of YBa2Cu3O6.5 using both polarized and unpolarized neutron inelastic scattering. The spin susceptibility in the superconducting phase exhibits one-dimensional incommensurate modulations at low energies, consistent with hydrodynamic stripes. With increasing energy the susceptibility curves upward to a commensurate, intense, well-defined, and asymmetric resonance at 33 meV with a precipitous high-energy cutoff. In the normal phase, which we show is gapless, the resonance remains surprisingly strong and persists clearly in Q scans and energy scans. Its similar asymmetric spectral form above Tc=59K suggests that incoherent superconducting pairing fluctuations are present in the normal state. On cooling, the resonance and the stripe modulations grow in well above Tc below a temperature that is comparable to the pseudogap temperature where suppression occurs in local and low-momentum properties. The spectral weight that accrues to the resonance is largely acquired by transfer from suppressed low-energy fluctuations. We find the resonance to be isotropically polarized, consistent with a triplet carrying 2.6% of the total spectral weight of the Cu spins in the planes.

  • Received 28 June 2003

DOI:https://doi.org/10.1103/PhysRevB.69.014502

©2004 American Physical Society

Authors & Affiliations

C. Stock1, W. J. L. Buyers2,3, R. Liang3,4, D. Peets4, Z. Tun2, D. Bonn3,4, W. N. Hardy3,4, and R. J. Birgeneau1,3

  • 1Department of Physics, University of Toronto, Ontario, Canada M5S 1A7
  • 2National Research Council, Chalk River, Ontario, Canada K0J 1J0
  • 3Canadian Institute of Advanced Research, Toronto, Ontario, Canada M5G 1Z8
  • 4Physics Department, University of British Columbia, Vancouver, British Columbia, Canada V6T 2E7

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Vol. 69, Iss. 1 — 1 January 2004

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