2000/03/01 by Dirk K. Morr, David Pines · 1 citation
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.61.r6483
published as Phys. Rev. B. 61, R6483 (2000) · 5 pages, 4 figures, Fig.3 is in color
openalex publication_date 2000/03/01 · arxiv created 2000/04/13 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Recent inelastic-neutron-scattering experiments on La_2\ensuremath-xSrxCuO4 observed a magnetic coherence effect, i.e., strong frequency- and momentum-dependent changes of the spin susceptibility, \ensuremathχ^\ensuremath'', 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\ensuremath-xSrxCuO4 which is closed around (\ensuremathπ,\ensuremathπ) up to optimal doping and (b) similar changes in \ensuremathχ^\ensuremath'' for all cuprates with an incommensurate magnetic response.