Effect of Superconductivity on the Incommensurate Magnetic Response of Cuprate Superconductors

Details Effect of Superconductivity on the Incommensurate Magnetic Response of Cuprate Superconductors Effect of Superconductivity on the Incommensurate Magnetic Response of Cuprate Superconductors

1998-07-14

arxiv.org/abs/cond-mat/9807214v1

Physics

Condensed Matter

Superconductivity

4 pages, RevTeX, 4 eps figures embedded in the text

Scientific paper

We explain the effects of superconductivity on the incommensurate magnetic response $\chi''(q,\omega)$ 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 $\chi''$ 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 $(\pi,\pi)$.

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