Spin-lattice relaxation in the mixed state of YBaCuO: Can we see Doppler-shifted d-wave quasiparticles?

Details Spin-lattice relaxation in the mixed state of YBaCuO: Can we see Doppler-shifted d-wave quasiparticles? Spin-lattice relaxation in the mixed state of YBaCuO: Can we see Doppler-shifted d-wave quasiparticles?

1999-07-06

arxiv.org/abs/cond-mat/9907093v1

Physics

Condensed Matter

Superconductivity

11 pages, 5 figures

Scientific paper

10.1103/PhysRevB.61.12342

We present calculations of the rate of planar Cu spin lattice relaxation in the mixed state of YBaCuO due to (i) vortex vibrations and (ii) electron spin-flip scattering. We emphasize that both mechanisms give position dependent rates due to the presence of vortices, and hence the magnetization recovery is characterized by a distribution of rates. We conclude that relaxation by vortex vibrations is too slow to be a significant factor in this material. Using a semiclassical model of Doppler shifted d-wave quasiparticles with a linear dispersion around the nodes, our calculation of the relaxation rate from electron spin-flip scattering shows partial agreement with experiment.

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