Fig. 1: RIXS from YBa2Cu4O8.
From: Coincident onset of charge order and pseudogap in a homogeneous high-temperature superconductor
a Temperature-doping phase diagram of YBa2Cu3O6+x (Y123). The characteristic regimes (i.e., superconductivity, pseudogap, and strange metal) are indicated. The T*(p) line follows recent surveys of the experimental literature1,6. The blue star indicates the doping level and pseudogap temperature T*(p = 0.14) of YBa2Cu4O8 (Y124) studied in the present work19. b Unit cell of YBa2Cu4O869. Cu1 and Cu2 indicate copper atoms in CuO chain layers and CuO2 planes, respectively. c Sample surfaces imaged through a polarized microscope. The top and center panels display the same surface observed at different in-plane angles. The light (dark) colored regions in the top (center) panel indicate twin domains indicated by the crystallographic axes in the legend. The white oval in the bottom panel indicates the X-ray beam spot on the sample during the RIXS measurements.
