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 SrTiO3 (001) and at the interface between nonmagnetic LaAlO3 and SrTiO3 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 EuTiO3, the magnetic counterpart of SrTiO3 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 EuTiO3(001) as a new material platform for oxide q2DEGs, characterized by broken inversion and time-reversal symmetries.
Source:
Physical Review Research, 2021, 3, 4, L042038-
Funding / projects:
QUANTOX [731473]
PRIN project TOP-SPIN [PRIN 20177SL7HC]
Swiss National Science Foundation [200021 182695]
German Research Foundation [107745057, subproject G3, 278162697, subproject No. C02]
TY - JOUR
AU - Di Capua, Roberto
AU - Verma, Manish
AU - Radović, Milan
AU - Plumb, Nicholas C.
AU - Dil, Jan Hugo
AU - Ristić, Zoran
AU - Guedes, Eduardo Bonini
AU - de Luca, Giovanna
AU - Preziosi, Daniele
AU - Wang, Zhiming
AU - Weber, Andrew P.
AU - Pentcheva, Rossitza
AU - Salluzzo, Marco
PY - 2021
UR - https://vinar.vin.bg.ac.rs/handle/123456789/10118
AB - 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 SrTiO3 (001) and at the interface between nonmagnetic LaAlO3 and SrTiO3 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 EuTiO3, the magnetic counterpart of SrTiO3 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 EuTiO3(001) as a new material platform for oxide q2DEGs, characterized by broken inversion and time-reversal symmetries.
T2 - Physical Review Research
T1 - Two-dimensional electron gas at the (001) surface of ferromagnetic EuTiO3
VL - 3
IS - 4
SP - L042038
DO - 10.1103/PhysRevResearch.3.L042038
ER -
@article{
author = "Di Capua, Roberto and Verma, Manish and Radović, Milan and Plumb, Nicholas C. and Dil, Jan Hugo and Ristić, Zoran and Guedes, Eduardo Bonini and de Luca, Giovanna and Preziosi, Daniele and Wang, Zhiming and Weber, Andrew P. and Pentcheva, Rossitza and Salluzzo, Marco",
year = "2021",
abstract = "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 SrTiO3 (001) and at the interface between nonmagnetic LaAlO3 and SrTiO3 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 EuTiO3, the magnetic counterpart of SrTiO3 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 EuTiO3(001) as a new material platform for oxide q2DEGs, characterized by broken inversion and time-reversal symmetries.",
journal = "Physical Review Research",
title = "Two-dimensional electron gas at the (001) surface of ferromagnetic EuTiO3",
volume = "3",
number = "4",
pages = "L042038",
doi = "10.1103/PhysRevResearch.3.L042038"
}
Di Capua, R., Verma, M., Radović, M., Plumb, N. C., Dil, J. H., Ristić, Z., Guedes, E. B., de Luca, G., Preziosi, D., Wang, Z., Weber, A. P., Pentcheva, R.,& Salluzzo, M.. (2021). Two-dimensional electron gas at the (001) surface of ferromagnetic EuTiO3. in Physical Review Research, 3(4), L042038.
https://doi.org/10.1103/PhysRevResearch.3.L042038
Di Capua R, Verma M, Radović M, Plumb NC, Dil JH, Ristić Z, Guedes EB, de Luca G, Preziosi D, Wang Z, Weber AP, Pentcheva R, Salluzzo M. Two-dimensional electron gas at the (001) surface of ferromagnetic EuTiO3. in Physical Review Research. 2021;3(4):L042038.
doi:10.1103/PhysRevResearch.3.L042038 .
Di Capua, Roberto, Verma, Manish, Radović, Milan, Plumb, Nicholas C., Dil, Jan Hugo, Ristić, Zoran, Guedes, Eduardo Bonini, de Luca, Giovanna, Preziosi, Daniele, Wang, Zhiming, Weber, Andrew P., Pentcheva, Rossitza, Salluzzo, Marco, "Two-dimensional electron gas at the (001) surface of ferromagnetic EuTiO3" in Physical Review Research, 3, no. 4 (2021):L042038,
https://doi.org/10.1103/PhysRevResearch.3.L042038 . .
