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J.E. Kleibeuker, Z. Zhong, H. Nishikawa, J. Gabel, A. Müller, F. Pfaff, M. Sing, K. Held, R. Claessen, G. Koster, G. Rijnders:
"Electronic Reconstruction at the Isopolar LaTiO3/LaFeO3 Interface: An X-Ray Photoemission and Density-Functional Theory Study";
Physical Review Letters, 113 (2014), 237402.

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 0.2 e−=interface unit cell in our
LaTiO3=LaFeO3 heterostructures.

http://dx.doi.org/10.1103/PhysRevLett.113.237402