NMR, Neutron scattering, and the one-band model of La_2-xSr_xCuO₄

Abstract

NMR data on ¹⁷O and ⁶³Cu in La_1.85Sr_xCuO₄ are presented and agree well with published work. Relaxation curves for ⁶³Cu and for both apical and planar ¹⁷O sites are compared with calculations based on parametrization of recent absolute neutron susceptibilities X"(q,ω). A reasonable accord is found with the ⁶³Cu data. However, a significant discrepancy with the observed planar ¹⁷O relaxation behavior poses an apparent contradiction with the widely accepted one-band dynamical model for this system.