Abstract
We report the formation of a nonmagnetic band insulator at the isopolar interface between the antiferromagnetic Mott-Hubbard insulator LaTiO3 and the antiferromagnetic charge transfer insulator LaFeO3. By density-functional theory calculations, we find that the formation of this interface state is driven by the combination of O band alignment and crystal field splitting energy of the t2g and eg bands. As a result of these two driving forces, the Fe 3d bands rearrange and electrons are transferred from Ti to Fe. This picture is supported by x-ray photoelectron spectroscopy, which confirms the rearrangement of the Fe 3d bands and reveals an unprecedented charge transfer up to 1.2±0.2e−/interface unit cell in our LaTiO3/LaFeO3 heterostructures.
Original language | English |
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Article number | 237402 |
Number of pages | 5 |
Journal | Physical review letters |
Volume | 113 |
Issue number | 23 |
DOIs | |
Publication status | Published - 2014 |