Extended Data Fig. 3: Three-dimensionality of the zone centre excitations in NCCO.
From: Three-dimensional collective charge excitations in electron-doped copper oxide superconductors
a, b, RIXS intensity maps of NCCO (x = 0.15) for momentum transfer along the h-direction at l* = 0.5 and l* = 0.825. Red and grey symbols indicate least-squares-fit peak positions of the zone centre excitation and the paramagnon, respectively. The inset indicates the probe direction in reciprocal space. c, RIXS intensity map of NCCO (x = 0.15) for momentum transfer along the out-of-plane direction at h = 0.025. White symbols indicate fitted peak positions of the zone centre excitation. Error bars are estimated from the uncertainty in energy-loss reference-point determination (±0.01 eV) together with the standard deviation of the fits.
