Physics – Condensed Matter – Superconductivity
Scientific paper
2000-07-25
Physics
Condensed Matter
Superconductivity
6 pages, 5 figures
Scientific paper
10.1103/PhysRevB.63.214509
Recent experimental and theoretical studies have established that the spin-lattice relaxation rate, $1/T_1$, measured in nuclear magnetic resonance (NMR) experiments is a site-sensitive probe for the electronic spectrum in the mixed state of the high-$T_c$ cuprates. While some groups suggested that $1/T_1$ is solely determined by spin-flip scattering of BCS-like electrons, other groups stressed the importance of antiferromagnetic spin-fluctuations. We show that these two relaxation mechanisms give rise to a {\it qualitatively} different temperature and frequency dependence of $^{17}$O $1/T_1$. A comparison of our results with the experimental $^{17}$O $1/T_1$ data provides support for a relaxation mechanism dominated by antiferromagnetic spin-fluctuations.
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