Photoemission from buried interfaces in SrTiO3/LaTiO3 superlattices

Details Photoemission from buried interfaces in SrTiO3/LaTiO3 superlattices Photoemission from buried interfaces in SrTiO3/LaTiO3 superlattices

2006-04-07

arxiv.org/abs/cond-mat/0604201v1

Phys. Rev. Lett. 97, 057601 (2006)

Physics

Condensed Matter

Materials Science

Scientific paper

10.1103/PhysRevLett.97.057601

We have measured photoemission spectra of SrTiO3/LaTiO3 superlattices with a topmost SrTiO3 layer of variable thickness. Finite coherent spectral weight with a clear Fermi cut-off was observed at chemically abrupt SrTiO3/LaTiO3 interfaces, indicating that an ``electronic reconstruction'' occurs at the interface between the Mott insulator LaTiO3 and the band insulator SrTiO3. For SrTiO3/LaTiO3 interfaces annealed at high temperatures (~ 1000 C), which leads to Sr/La atomic interdiffusion and hence to the formation of La1-xSrxTiO3-like material, the intensity of the incoherent part was found to be dramatically reduced whereas the coherent part with a sharp Fermi cut-off is enhanced due to the spread of charge. These important experimental features are well reproduced by layer dynamical-mean-field-theory calculation.

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