A two-dimensional electron gas at the (001) surface of ferromagnetic EuTiO$_{3}$(001) - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Physical Review Research Année : 2021

A two-dimensional electron gas at the (001) surface of ferromagnetic EuTiO$_{3}$(001)

Résumé

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 and at the interface between LaAlO$_{3}$ and SrTiO$_{3}$ non-magnetic materials. However, magnetism in this system is weak and there are evidences of a not intrinsic 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.

Dates et versions

hal-03437401 , version 1 (19-11-2021)

Identifiants

Citer

R. Di Capua, M. Verma, M. Radovic, N. C. Plumb, J. H. Dil, et al.. A two-dimensional electron gas at the (001) surface of ferromagnetic EuTiO$_{3}$(001). Physical Review Research, 2021, 3 (4), pp.L042038. ⟨10.1103/PhysRevResearch.3.L042038⟩. ⟨hal-03437401⟩
58 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More