Central mode and spin confinement near the boundary of the superconducting phase in Y Ba2 Cu3 O6.353 (Tc =18 K)

C. Stock, W. J.L. Buyers, Z. Yamani, C. L. Broholm, J. H. Chung, Z. Tun, R. Liang, D. Bonn, W. N. Hardy, R. J. Birgeneau

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Abstract

We have mapped the neutron scattering spin spectrum at low energies in Y Ba2 Cu3 O6.353 (Tc =18 K), 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 2 meV relaxation rate and the other a central mode with a relaxation rate that slows to less than 0.08 meV below Tc. The spectrum mirrors that of a soft mode driving a central mode. Extremely short correlation lengths, 42±5 Å in-plane and 8±2 Å 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.

Original languageEnglish
Article number100504
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume73
Issue number10
DOIs
Publication statusPublished - 2006

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Stock, C., Buyers, W. J. L., Yamani, Z., Broholm, C. L., Chung, J. H., Tun, Z., Liang, R., Bonn, D., Hardy, W. N., & Birgeneau, R. J. (2006). Central mode and spin confinement near the boundary of the superconducting phase in Y Ba2 Cu3 O6.353 (Tc =18 K). Physical Review B - Condensed Matter and Materials Physics, 73(10), [100504]. https://doi.org/10.1103/PhysRevB.73.100504