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We report here on the electronic structure of electron-doped half-metallicferromagnetic perovskites such Sr$_{2-x}$La$_x$FeMoO$_6$ ($x$=0-0.6) asobtained from high-resolved valence-band photoemission spectroscopy (PES). Bycomparing the PES spectra with band structure calculations, a distinctive peakat the Fermi level (E$_F$) with predominantly (Fe+Mo) t$_{2g}^\downarrow$character has been evidenced for all samples, irrespectively of the $x$ valuesinvestigated. Moreover, we show that the electron doping due to the Lasubstitution provides selectively delocalized carriers to thet$_{2g}^\downarrow$ metallic spin channel. Consequently, a gradual rising ofthe density of states at the E$_F$ has been observed as a function of the Ladoping. By changing the incoming photon energy we have shown that electrondoping mainly rises the density of states of Mo parentage. These findingsprovide fundamental clues for understanding the origin of ferromagnetism inthese oxides and shall be of relevance for tailoring oxides having still higherT$_C$

physical review. b, condensed matter and materials physics

Curie-temperature enhancement of electron-doped<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">FeMoO</mml:mi></mml:mrow><mml:mrow><mml:mn>6</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>perovskites studied by photoemission spectroscopy

Curie-temperature enhancement of electron-dopedSr2FeMoO6perovskites studied by photoemission spectroscopy