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

A. J. Melville; A. Schmehl; D. E. Shai; D. G. Schlom; D. W. Shen; E. J. Monkman; J. W. Harter; K. M. Shen

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

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arxiv 1207.4490 v1 pith:MYTNOR7P submitted 2012-07-18 cond-mat.str-el

D. E. Shai , A. J. Melville , J. W. Harter , E. J. Monkman , D. W. Shen , A. Schmehl , D. G. Schlom , K. M. Shen This is my paper

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keywords ferromagneticzoneboundarybrillouinelectronicmetal-insulatorstatesstructure

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

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