Fig. 2: RIXS intensity maps.

Maps for p = 0.25 sample taken at 45 K. a H − E map over the H range ± 0.375. White circles are the energies of the feature in Fig. 1b, c believed to be a phonon and the intensity of the feature is plotted in b, along with a line proportional to \({\sin }^{2}(\pi H)\) in red. c The elastic intensity obtained by integrating the RIXS intensity between −100 < E < 100 meV, and dividing by the integral between 1000 < E < 3000 meV. Peaks at H ≈ ±0.31 are due to the charge density wave. d–f are RIXS intensity maps of the peak centred at H ≈ −0.31 at different temperatures.