Effect of phase fluctuations on INS and NMR experiments in the pseudo-gap regime of the underdoped cuprates

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We present a theory for inelastic neutron scattering (INS) and nuclear magnetic resonance (NMR) experiments in the pseudo-gap regime of the underdoped high-$T_c$ cuprates. We show that superconducting phase fluctuations greatly affect the temperature and frequency dependence of the spin-susceptibility, $χ''$, probed by both experimental techniques. This result explains the appearance of a {\it resonance peak}, observed in INS experiments, below a temperature $T_0 > T_c$. In the same temperature regime, we find that the $^{63}$Cu spin-lattice relaxation rate, $1/T_1$, measured in NMR experiments, is suppressed. Our results are in qualitative agreement with the available experimental data.
5 pages, RevTeX, 3 eps figures embedded in the text

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Superconductivity, Strongly Correlated Electrons

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http://salesiana.dossiersoluciones.com/handle/123456789/16012

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0002039
 http://arxiv.org/abs/cond-mat/0002039

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arXiv