Magnetic Coherence in Cuprate Superconductors
Abstract
Recent inelastic neutron scattering (INS) experiments on La2-xSrxCuO4 observed a magnetic coherence effect, i.e., strong frequency and momentum dependent changes of the spin susceptibility, '', in the superconducting phase. We show that this effect is a direct consequence of changes in the damping of incommensurate antiferromagnetic spin fluctuations due to the appearance of a d-wave gap in the fermionic spectrum. Our theoretical results provide a quantitative explanation for the weak momentum dependence of the observed spin-gap. Moreover, we predict (a) a Fermi surface in La2-xSrxCuO4 which is closed around (π,π) up to optimal doping, and (b) similar changes in '' for all cuprates with an incommensurate magnetic response.
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