Müller, Martina

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Martina
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Complex nature of exchange splitting in oxide ferromagnets : A spin-resolved photoemission study of EuO

2020, Heider, Tristan, Gerber, Tim, Köksal, Okan, Eschbach, Markus, Mlynczak, Ewa, Lömker, Patrick, Gospodaric, Pika, Gehlmann, Mathias, Plucinski, Lukasz, Müller, Martina

The electronic structure of the ferromagnetic semiconductor EuO is investigated by means of spin- and angle-resolved photoemission spectroscopy and density functional theory. Our spin-resolved data reveals that, while the macroscopic magnetization of the sample vanishes at the Curie temperature TC, the experimentally-determined exchange splitting of the O 2p band persists at least up to TC if the picture of fluctuating spin-blocks is assumed. We discuss possible temperature-related spectral changes by analyzing ferromagnetic and antiferromagnetic phases, directional effect due to spin orbit coupling, as well as effects due to sample aging. Our calculations with a Hubbard U term reveal a complex nature of the local exchange splitting on the oxygen site and in conduction bands, shining a new light on the interpretation of previous optical and photoemission spectroscopic results.