We investigate the electronic structure of ${\mathrm{Sr}}_2{\mathrm{FeMoO}}_6$ combining photoemission spectroscopy with a wide range of photon energies and electronic structure calculations based on first-principle as well as model Hamiltonian approaches to reveal several interesting aspects. We find evidence for unusually strong Coulomb correlation effects both in the Fe $3d$ and O $2p$ states, with an enhanced manifestation in the majority spin channel. Additionally, O $2p$ states exhibit a spin splitting of nonmagnetic origin, which nevertheless is likely to have a subtle influence on the stability of the ferromagnetism of this compound.

• Received 8 October 2002

DOI:https://doi.org/10.1103/PhysRevB.67.085109