Novel aspects and strong correlation in the electronic structure of   Sr$_2$FeMoO$_6$
  We investigate the electronic structure of Sr$_2$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 3$d$ and O 2$p$ states, with an enhanced manifestation in the majority spin channel. Additionally, O 2$p$ states exhibit a spin-splitting of nonmagnetic origin, which nevertheless is likely to have subtle influence on the stability of novel ferromagnetism of this compound. 
Sugata Ray, Priya Mahadevan, Ashwani Kumar, D.D. Sarma, R. Cimino, M.   Pedio, L. Ferrari and A. Pesci