Effect of Superconductivity on the Incommensurate Magnetic Response of Cuprate Superconductors
Dirk K. Morr, David Pines
Abstract
We explain the effects of superconductivity on the incommensurate magnetic response χ''(q,ω) observed in inelastic neutron scattering measurements on La2-xSrxCuO4. 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 La2-xSrxCuO4 up to optimal doping suggests a Fermi surface which is closed around (π,π).
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