Oxygen on-site Coulomb energy in Pr_{1.3-x}La_{0.7}Ce_xCuO_{4} and Bi_2Sr_2CaCu_2O_{8+δ} and its relation with Heisenberg exchange

We study the electronic structure of electron-doped Pr_{1.3-x}La_{0.7}Ce_{x}CuO_{4} (PLCCO ; T_{c} = 27 K, x = 0.1) and hole-doped Bi_2Sr_2CaCu_2O_{8+\delta} (Bi2212 ; T_{c} = 90 K) cuprate superconductors using x-ray absorption spectroscopy (XAS) and resonant photoemission spectroscopy (Res-PES). From Res-PES across the O K-edge and Cu L-edge, we identify the... Show more