High temperature superconducting oxychlorides : a light element model for magnetic excitations in cuprates.

Para-magnons are considered one of the possible bosons leading to Cooper pairing in cuprates. However, theory has long failed to describe the electronic state of doped cuprates, as they are difficult to treat with calculations that incorporate correlations. We are currently doing detailed first-principle calculations in oxychloride cuprates, including techniques that explicitly incorporate the electron-electron interactions and that are particularly well suited for our case. We will complete our study of paramagnons in oxychlorides, at the highest doping, in order to maximize the effect of the mobile charges on the magnetic excitation, as well as very low doping, in the pure pseudo-gap phase, in order to compare the results with our calculations.