Temperature-dependent spin-resolved electronic structure of EuO thin films

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2022
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Heider, Tristan
Gerber, Timm
Köksal, Okan
Eschbach, Markus
Młyńczak, Ewa
Lömker, Patrick
Gospodaric, Pika
Gehlmann, Mathias
Plötzing, Moritz
Pentcheva, Rossitza
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Physical Review B. American Physical Society (APS). 2022, 106, 054424. ISSN 2469-9950. eISSN 2469-9969. Available under: doi: 10.1103/PhysRevB.106.054424
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The electronic structure of the ferromagnetic semiconductor EuO is investigated by means of spin- and angle-resolved photoemission spectroscopy (spin-ARPES) and density functional theory. EuO exhibits unique properties of hosting both weakly dispersive nearly fully polarized Eu 4f bands, as well as O 2p levels indirectly exchange-split by the interaction with Eu nearest neighbors. Our temperature-dependent spin-ARPES data directly demonstrate the exchange splitting in O 2p and its vanishing at the Curie temperature. Our calculations with a Hubbard U term reveal a complex nature of the local exchange splitting on the oxygen site and in conduction bands. We discuss the mechanisms of indirect exchange in the O 2p levels by analyzing the orbital resolved band characters in ferromagnetic and antiferromagnetic phases. The directional effects due to spin-orbit coupling are predicted theoretically to be significant in particular in the Eu 4f band manifold. The analysis of the shape of spin-resolved spectra in the Eu 4f spectral region reveals signatures of hybridization with O 2p states, in agreement with the theoretical predictions. We also analyze spectral changes in the spin-integrated spectra throughout the Curie temperature, and demonstrate that they derive from both the magnetic phase transition and effects due to sample aging, unavoidable for this highly reactive material.

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ISO 690HEIDER, Tristan, Timm GERBER, Okan KÖKSAL, Markus ESCHBACH, Ewa MŁYŃCZAK, Patrick LÖMKER, Pika GOSPODARIC, Mathias GEHLMANN, Moritz PLÖTZING, Rossitza PENTCHEVA, Lukasz PLUCINSKI, Claus M. SCHNEIDER, Martina MÜLLER, 2022. Temperature-dependent spin-resolved electronic structure of EuO thin films. In: Physical Review B. American Physical Society (APS). 2022, 106, 054424. ISSN 2469-9950. eISSN 2469-9969. Available under: doi: 10.1103/PhysRevB.106.054424
BibTex
@article{Heider2022Tempe-58623,
  year={2022},
  doi={10.1103/PhysRevB.106.054424},
  title={Temperature-dependent spin-resolved electronic structure of EuO thin films},
  volume={106},
  issn={2469-9950},
  journal={Physical Review B},
  author={Heider, Tristan and Gerber, Timm and Köksal, Okan and Eschbach, Markus and Młyńczak, Ewa and Lömker, Patrick and Gospodaric, Pika and Gehlmann, Mathias and Plötzing, Moritz and Pentcheva, Rossitza and Plucinski, Lukasz and Schneider, Claus M. and Müller, Martina},
  note={Article Number: 054424}
}
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