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We present angle-resolved photoemission spectroscopy of Eu(1-x)Gd(x)O throughthe ferromagnetic metal-insulator transition. In the ferromagnetic phase, weobserve Fermi surface pockets at the Brillouin zone boundary, consistent withdensity functional theory, which predicts a half metal. Upon warming into theparamagnetic state, our results reveal a strong momentum-dependent evolution ofthe electronic structure, where the metallic states at the zone boundary arereplaced by pseudogapped states at the Brillouin zone center due to the absenceof magnetic long-range order of the Eu 4f moments.

physical review letters

Temperature dependence of the electronic structure and Fermi-surface  reconstruction of Eu(1-x)Gd(x)O through the ferromagnetic metal-insulator  transition