Wadati, H.; Geck, J.; Hawthorn, D.G.; Higuchi, T.; Hosoda, M.; Bell, C.; Hikita, Y.; Hwang, H.Y.; Schussler-Langeheine, C.; Schierle, E.; Weschke, E.; Sawatzky, G.A.:
Electronic structure of the SrTiO3/LaAlO3 interface
revealed by resonant soft x-ray scattering. In: BURIED INTERFACE SCIENCES WITH X-RAYS AND NEUTRONS 2010. , 2011 (IOP Conference Series: Materials Science and Engineering 24), p. 012012/1-9
DOI version (server of publisher)
Abstract:
Interfaces in heterostructures composed of two different transition-metal oxides are
now a strongly growing research topic in condensed-matter physics due to the anomalous
electronic properties very different from those of the component materials. Here we present
resonant soft x-ray scattering studies of SrTiO3/LaAlO3 superlattices. From the existence of the
forbidden Bragg peak (003), we found evidence for differences between the bulk and the
interface electronic structures. The photon-energy dependence near the O 1s edge and
polarization dependence showed that there are two structures split by ~ 1 eV, which were not
observed in the O 1s x-ray absorption spectrum. The origin of this splitting is still unclear, but
we consider that this is not only due to the splitting of t2g states at the interface but also due to
the difference between the O 1s binding energies for bulk and interface oxygen.
