Local-field dependence of the 17O spin-lattice relaxation and echo decay rates in the mixed state of YBa2Cu3O7

N. J. Curro, C. Milling, J. Haase, and C. P. Slichter
Phys. Rev. B 62, 3473 – Published 1 August 2000
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Abstract

We find that the planar and apical 17O NMR spin-lattice relaxation rate (1/T1) and the spin-echo decay rate (1/T2) are spatially dependent in the mixed state of YBa2Cu3O7. For both sites, 1/T1 and 1/T2 increase by a factor of 2 to 3 for nuclei close to the vortex cores. The data suggest that fluctuating fields from the low-frequency vibrations of the vortex lattice give rise to the similar echo decay observed at both sites. These vibrations also dominate 1/T1 for both sites below T25K. Above this temperature, the planar 1/T1 is dominated by spin-flip scattering with delocalized quasiparticles associated with the nodes in the superconducting gap showing that the position dependence arises from the effect of the supercurrents on the quasiparticle energy spectrum.

  • Received 1 February 2000

DOI:https://doi.org/10.1103/PhysRevB.62.3473

©2000 American Physical Society

Authors & Affiliations

N. J. Curro*, C. Milling, J. Haase, and C. P. Slichter

  • Department of Physics and Materials Research Laboratory, University of Illinois at Urbana-Champaign, 1110 West Green Street, Urbana, Illinois 61801

  • *Present address: Los Alamos National Laboratory, Los Alamos, NM 87545.
  • Also at Department of Chemistry, University of Illinois at Urbana-Champaign.

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Vol. 62, Iss. 5 — 1 August 2000

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