Report
Temperature-dependent spin-resolved electronic structure of EuO thin films
| العنوان: | Temperature-dependent spin-resolved electronic structure of EuO thin films |
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| المؤلفون: | Heider, Tristan, Gerber, Timm, Köksal, Okan, Eschbach, Markus, Młyńczak, Ewa, Lömker, Patrick, Gospodaric, Pika, Gehlmann, Mathias, Plötzing, Moritz, Pentcheva, Rossitza, Plucinski, Lukasz, Schneider, Claus M., Müller, Martina |
| المصدر: | Phys. Rev. B 106, 054424 (2022) |
| سنة النشر: | 2018 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Materials Science, Condensed Matter - Strongly Correlated Electrons |
| الوصف: | 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 demonstrates 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 the indirect exchange in the O 2p levels by analyzing 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 $2p$, in agreement with the theoretical predictions. We also analyze spectral changes in the spin-integrated spectra throughout the Curie temperature and demonstrate they derive from both the magnetic phase transition and effects due to sample aging, unavoidable for this highly reactive material. Comment: 9 pages, 6 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevB.106.054424 |
| URL الوصول: | http://arxiv.org/abs/1809.00631 |
| رقم الانضمام: | edsarx.1809.00631 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevB.106.054424 |
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