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Central mode and spin confinement near the boundary of the superconducting phase in YBa2Cu3O6.353 (Tc=18K)

C. Stock, W. J. L. Buyers, Z. Yamani, C. L. Broholm, J.-H. Chung, Z. Tun, R. Liang, D. Bonn, W. N. Hardy, and R. J. Birgeneau
Phys. Rev. B 73, 100504(R) – Published 22 March 2006

Abstract

We have mapped the neutron scattering spin spectrum at low energies in YBa2Cu3O6.353 (Tc=18K), where the doping 0.06 is near the critical value (pc=0.055) for superconductivity. No coexistence with long-range-ordered antiferromagnetism is found. The spins fluctuate on two energy scales: one a damped spin response with a 2meV relaxation rate and the other a central mode with a relaxation rate that slows to less than 0.08meV below Tc. The spectrum mirrors that of a soft mode driving a central mode. Extremely short correlation lengths, 42±5Å in-plane and 8±2Å along the c direction, and isotropic spin orientations for the central mode indicate that the correlations are subcritical with respect to any second-order transition to Néel order. The dynamics follows a model where damped spin fluctuations are coupled to the slow fluctuations of regions with correlations shortened by the hole doping.

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  • Received 13 January 2006

DOI:https://doi.org/10.1103/PhysRevB.73.100504

©2006 American Physical Society

Authors & Affiliations

C. Stock1,2, W. J. L. Buyers3,4, Z. Yamani3, C. L. Broholm2, J.-H. Chung5,6, Z. Tun3, R. Liang7,4, D. Bonn7,4, W. N. Hardy7,4, and R. J. Birgeneau8,4

  • 1Department of Physics, University of Toronto, Ontario, Canada, M5S 1A7
  • 2Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA
  • 3National Research Council, Chalk River, Ontario, Canada, K0J 1J0
  • 4Canadian Institute of Advanced Research, Toronto, Ontario, Canada, M5G 1Z8
  • 5NIST Center for Neutron Research, Gaithersburg, Maryland 20899, USA
  • 6Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, USA
  • 7Physics Department, University of British Columbia, Vancouver, British Columbia, Canada, V6T 2E7
  • 8Department of Physics, University of California at Berkeley, Berkeley, California 94720, USA

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Issue

Vol. 73, Iss. 10 — 1 March 2006

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