The principal purpose of this topical review is to single out some of the universal features of
high-temperature (high-T c) and related strongly-correlated systems, which can be …

High T c superconductors show a rich variety of phases associated with their charge
degrees of freedom. Valence charges can give rise to charge ordering or acoustic plasmons …

Applications are being found for superconducting materials in a rapidly growing number of
technological areas, and the search for novel superconductors remains a major scientific …

Cuprate superconductors have the highest critical temperatures (T c) at ambient pressure,
yet a consensus on the superconducting mechanism remains to be established. Finding an …

Using Cu-L 3 edge resonant inelastic x-ray scattering (RIXS) we measured the dispersion
and damping of spin excitations (magnons and paramagnons) in the high-T c …

High-resolution resonant inelastic x-ray scattering (RIXS) has proven particularly effective in
the determination of crystal field and spin excitations in cuprates. Its strength lies in the large …

Electron correlations play a dominant role in the charge dynamics of the cuprates. We use
resonant inelastic X-ray scattering (RIXS) to track the doping dependence of the collective …

While the pseudogap dominates the phase diagram of hole-doped cuprates, connecting the
antiferromagnetic parent insulator at low doping to the strange metal at higher doping, its …

The layered crystal structures of cuprates enable collective charge excitations fundamentally
different from those of three-dimensional metals. Acoustic plasmons have been observed in …

We provide a unified interpretation of both paramagnon and plasmon modes in high-T c
copper-oxides, and verify it quantitatively against available resonant inelastic x-ray …