| Autor: |
R. Di Capua, M. Verma, M. Radović, N. C. Plumb, J. H. Dil, Z. Ristić, E. B. Guedes, G. M. De Luca, D. Preziosi, Z. Wang, A. P. Weber, R. Pentcheva, M. Salluzzo |
| Jazyk: |
angličtina |
| Rok vydání: |
2021 |
| Předmět: |
|
| Zdroj: |
Physical Review Research, Vol 3, Iss 4, p L042038 (2021) |
| Druh dokumentu: |
article |
| ISSN: |
2643-1564 |
| DOI: |
10.1103/PhysRevResearch.3.L042038 |
| Popis: |
Studies on oxide quasi-two-dimensional electron gas (q2DEG) have been a playground for the discovery of novel and sometimes unexpected phenomena, like the reported magnetism at the surface of SrTiO_{3} (001) and at the interface between nonmagnetic LaAlO_{3} and SrTiO_{3} band insulators. However, magnetism in this system is weak and there is evidence of a nonintrinsic origin. Here, by using in situ high-resolution angle-resolved photoemission, we demonstrate that ferromagnetic EuTiO_{3}, the magnetic counterpart of SrTiO_{3} in the bulk, hosts a q2DEG at its (001) surface. This is confirmed by density functional theory calculations with Hubbard U terms in the presence of oxygen divacancies in various configurations, all of them leading to a spin-polarized q2DEG related to the ferromagnetic order of Eu-4f magnetic moments. The results suggest EuTiO_{3}(001) as a new material platform for oxide q2DEGs, characterized by broken inversion and time-reversal symmetries. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
|
