Study of dynamic charge-density-wave correlations in HgBa2CuO4+d

High-Tc superconductivity (SC) in the cuprates is a thoroughly investigated, yet still unresolved problem. A prominent theoretical model suggests that dynamic charge-density-wave (CDW) correlations are responsible for the pseudogap (PG) and SC, and requires the existence of dynamic CDW correlations in a much larger part of the phase diagram than previously thought . Our resonant inelastic X-ray scattering (RIXS) work in HgBa2CuO4+d (Hg1201) revealed dynamic CDW correlations above the CDW ordering temperature, and evidence for a connection with the pairing glue. This is consistent with the theoretical proposal, but there remain important questions about the connection between CDW, PG and SC. We therefore wish to extend our work to optimally-doped Hg1201, where Tc is highest and static CDW correlations are weak, and to a wider temperature range to investigate the effect of doping and the relationship between CDW, SC, and the PG phase.