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- Publisher
- American Physical Society (APS)
- Copyright
- Copyright © 2000 The American Physical Society
- ISSN
- 1095-3795
- DOI
- 10.1103/PhysRevB.61.R6483
- Publisher site
- See Article on Publisher Site
Abstract
Recent inelastic-neutron-scattering experiments on La 2 - x Sr x CuO 4 observed a magnetic coherence effect , i.e., strong frequency- and momentum-dependent changes of the spin susceptibility, χ ″ , 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 La 2 - x Sr x CuO 4 which is closed around ( π , π ) up to optimal doping and (b) similar changes in χ ″ for all cuprates with an incommensurate magnetic response.
Journal
Physical Review B – American Physical Society (APS)
Published: Mar 1, 2000