Skip to Main content Skip to Navigation
Journal articles

Influence of hole depletion and depolarizing field on the BaTiO3/La0.6Sr0.4MnO3 interface electronic structure revealed by photoelectron spectroscopy and first-principles calculations

Abstract : The effects of the bonding mechanism and band alignment in a ferroelectric (FE) BaTiO3/ferromagnetic La0.6Sr0.4MnO3 heterostructure are studied using x-ray photoelectron spectroscopy and first-principles calculations. The band lineup at the interface is determined by a combination of band bending and polarization-induced modification of core-hole screening. A Schottky barrier height for electrons of 1.22 ± 0.17 eV is obtained in the case of downwards FE polarization of the top layer. The symmetry of the bonding states is emphasized by integrating the local density of states ±0.2 eV around the Fermi level, and strong dependence on the FE polarization is found: upwards, polarization stabilizes Ti t2g(xy) orbitals, while downwards, polarization favors Ti t2g(yz) symmetry. It is predicted that the abrupt (La,Sr)|TiO2 interface is magnetoelectrically active, leading to a A-type antiferromagnetic coupling of the first TiO2 interface layer with the underlying manganite layer through a superexchange mechanism
Document type :
Journal articles
Complete list of metadatas

Cited literature [63 references]  Display  Hide  Download

https://hal-cea.archives-ouvertes.fr/cea-01347245
Contributor : Bruno Savelli <>
Submitted on : Wednesday, July 20, 2016 - 4:19:06 PM
Last modification on : Friday, April 24, 2020 - 10:28:07 AM

File

PhysRevB.pdf
Publisher files allowed on an open archive

Identifiers

Citation

D.G. Popescu, Nicholas Barrett, Christina Chirila, Iuliana Pasuk, M. A. Husanu. Influence of hole depletion and depolarizing field on the BaTiO3/La0.6Sr0.4MnO3 interface electronic structure revealed by photoelectron spectroscopy and first-principles calculations. Physical Review B: Condensed Matter and Materials Physics, American Physical Society, 2015, 92, pp.235442. ⟨10.1103/PhysRevB.92.235442⟩. ⟨cea-01347245⟩

Share

Metrics

Record views

158

Files downloads

202