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

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2020

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Heider, Tristan
Gerber, Tim
Köksal, Okan
Eschbach, Markus
Mlynczak, Ewa
Lömker, Patrick
Gospodaric, Pika
Gehlmann, Mathias
Plucinski, Lukasz
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http://arxiv.org/abs/1809.00631v2

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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.

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ISO 690HEIDER, Tristan, Tim GERBER, Okan KÖKSAL, Markus ESCHBACH, Ewa MLYNCZAK, Patrick LÖMKER, Pika GOSPODARIC, Mathias GEHLMANN, Lukasz PLUCINSKI, Martina MÜLLER, 2020. Complex nature of exchange splitting in oxide ferromagnets : A spin-resolved photoemission study of EuO
BibTex
@unpublished{Heider2020Compl-53584,
  year={2020},
  title={Complex nature of exchange splitting in oxide ferromagnets : A spin-resolved photoemission study of EuO},
  author={Heider, Tristan and Gerber, Tim and Köksal, Okan and Eschbach, Markus and Mlynczak, Ewa and Lömker, Patrick and Gospodaric, Pika and Gehlmann, Mathias and Plucinski, Lukasz and Müller, Martina}
}
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    <dcterms:abstract xml:lang="eng">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.</dcterms:abstract>
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