Resonant Inelastic X-ray Scattering study of charge density waves in highly overdoped superconducting La2-xCaxCuO4 thin films

Charge density wave (CDW) order was observed in all cuprate families and most studies to date showed that CDW correlations are confined to the underdoped regime. However, recent studies revealed the presence of CDW even in the overdoped regime. Our group recently succeeded in growing high quality thin films of La2-xCaxCuO4 (LCCO) in the overdoped regime with dopings up to x = 0.5 and observed that superconductivity surprisingly persists even at such high dopings, with Tc ~ 20 K at x = 0.5. Here, we propose to carry out high-resolution Cu-L3 resonant inelastic x-ray scattering (RIXS) on these LCCO thin films to investigate the presence of CDW order and provide a conclusion as to whether the CDW in the overdoped regime is a universal feature of cuprate supercondcutors.