Magnetic Coherence in Cuprate Superconductors

Details Magnetic Coherence in Cuprate Superconductors Magnetic Coherence in Cuprate Superconductors

2000-04-13

arxiv.org/abs/cond-mat/0004220v1

Phys. Rev. B. 61, R6483 (2000)

Physics

Condensed Matter

Superconductivity

5 pages, 4 figures, Fig.3 is in color

Scientific paper

10.1103/PhysRevB.61.R6483

Recent inelastic neutron scattering (INS) experiments on La$_{2-x}$Sr$_x$CuO$_4$ observed a {\it magnetic coherence effect}, i.e., strong frequency and momentum dependent changes of the spin susceptibility, $\chi''$, 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 {\bf (a)} a Fermi surface in La$_{2-x}$Sr$_x$CuO$_4$ which is closed around $(\pi,\pi)$ up to optimal doping, and {\bf (b)} similar changes in $\chi''$ for all cuprates with an incommensurate magnetic response.

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