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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
Cited literature [63 references]
https://hal-cea.archives-ouvertes.fr/cea-01347245
Contributor : Bruno Savelli Connect in order to contact the contributor
Submitted on : Wednesday, July 20, 2016 - 4:19:06 PM
Last modification on : Monday, December 13, 2021 - 9:14:37 AM
Contributor : Bruno Savelli Connect in order to contact the contributor
Submitted on : Wednesday, July 20, 2016 - 4:19:06 PM
Last modification on : Monday, December 13, 2021 - 9:14:37 AM
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PhysRevB.pdf
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