Magnetic Coherence in Cuprate Superconductors

Abstract

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, ${\chi }^{\prime \prime }$, 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 ${\chi }^{\prime \prime }$ for all cuprates with an incommensurate magnetic response.

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

References in corpus (1)

• Spin gap and magnetic coherence in a clean high-T_c superconductor

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