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We report the formation of a non-magnetic band insulator at the isopolarinterface between the antiferromagnetic Mott-Hubbard insulator LaTiO3 and theantiferromagnetic charge transfer insulator LaFeO3. By density functionaltheory calculations, we find that the formation of this interface state isdriven by the combination of O band alignment and crystal field splittingenergy of the t2g and eg bands. As a result of these two driving forces, the Fe3d bands rearrange and electrons are transferred from Ti to Fe. This picture issupported by x-ray photoelectron spectroscopy, which confirms the rearrangementof the Fe 3d bands and reveals an unprecedented charge transfer up to 1.2+/-0.2e-/interface unit cell in our LaTiO3/LaFeO3 heterostructures.

Electronic reconstruction at the isopolar LaTiO3/LaFeO3 interface: An x-ray photoemission and density functional theory study