Effect of Superconductivity on the Incommensurate Magnetic Response of Cuprate Superconductors

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We explain the effects of superconductivity on the incommensurate magnetic response $χ''(q,ω)$ observed in inelastic neutron scattering measurements on La$_{2-x}$Sr$_x$CuO$_4$. We show that a spin-fermion model correctly describes the frequency and momentum dependent changes of $χ''$ in the superconducting phase. We find these changes are generic features of an incommensurate spin structure and the d-wave symmetry of the superconducting gap and are thus expected for all cuprates with an incommensurate magnetic response. Our analysis of INS experiments in La$_{2-x}$Sr$_x$CuO$_4$ up to optimal doping suggests a Fermi surface which is closed around $(π,π)$.
4 pages, RevTeX, 4 eps figures embedded in the text

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Superconductivity, Strongly Correlated Electrons

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http://salesiana.dossiersoluciones.com/handle/123456789/28441

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/9807214
 http://arxiv.org/abs/cond-mat/9807214

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arXiv