Seminarium Fizyki Materii Skondensowanej

In the crowded phase diagram of high Tc superconducting cuprates, charge order phenomena are almost as pervasive as short range spin-spin correlations. Whereas it is widely accepted that spin fluctuations are not stranger to Cooper pair formation in these unconventional superconductors, the role of charge order is less clear. Resonant Inelastic X-ray Scattering (RIXS) provides an special insight because it provides the wave-vector of charge order, the energy of associated fluctuations, the dispersion anomalies of some high energy optical phonons and of paramagnons. Moreover, RIXS provides a unique experimental access to the q-dependence of the electron-phonon coupling. I will present some recent results on several hole-doped cuprates that demonstrate that charge order cannot be neglected when searching for an explanation of high temperature superconductivity.