Fig. 1 Effective magnetic dispersions measured by inelastic neutron scattering for: (left) La2CuO4 from Coldea et al. 2001; (middle) La1.95Sr0.05CuO4 from Goka et al. 2003; (right) La1.875Ba0.125CuO4 (Tranquada et al 2004). In each case the dispersion is measured about the AF wave vector.
Fig. 2: (a) Plot of incommensurability δ vs.\ x for La2−xSrxCuO4 (LSCO), from Fujita et al.2002. Insets indicate orientation of incommensurate peaks for x≲ (upper left) and for x\gtrsim0.055 (lower right). (b) Orientation angle of the incommensurate peaks.