High-energy Magnetic Excitations in Electron-doped High-T_c Cuprate

Abstract

We introduce the inelastic neutron and synchrotron X-ray scattering studies on the magnetic excitation in the electron-doped copper oxide. The recent development of state-of-the-art spectrometers at large facilities such as J-PARC enables us to study composite dynamics in the energy-momentum space arising from the interacting degrees of freedom. High-T_c copper oxide superconductor is exotic systems, in which the spin and charge degrees of freedom are coupled. We found the elongation of spin excitation by the electron-doping, which is quite different from the negligible doping effect in the hole-doped system. Therefore, there exists the electron-hole asymmetry in the observed spin excitation against the doping.