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

R. Wortis·A. J. Berlinsky·C. Kallin
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Abstract

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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R. Wortis, A. J. Berlinsky, C. Kallin. 1999-07-06. Spin-lattice relaxation in the mixed state of YBaCuO: Can we see Doppler-shifted d-wave quasiparticles?. https://doi.org/10.1103/physrevb.61.12342

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