Effect of surface oxygen vacancies on electronic states of reduced SrTiO3(110) surface

Y. Aiura, H. Bando, T. Maruyama, Y. Nishihara, Y. Haruyama, S. Kodaira, T. Komeda, Y. Sakisaka, H. Kato

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The electronic structure of reduced SrTiO3(110) surface prepared by annealing in ultrahigh vacuum (UHV), has been studied using photoemission spectroscopy (PES) and scanning tunneling microscopy/spectroscopy (STM/STS). In the PES spectra of reduced SrTiO3(110) surface after annealing in UHV at 800°C, a clear metallic state with a sharp Fermi cut-off and a broad state centered at ∼1.1eV below the Fermi level are observed in the band gap region. A Ti3p->3d resonance enhancement is occurred for the metallic state, but not for the ∼1.1eV state. On the other hand, after the sample was annealed in UHV at 1000°C, it has been shown that the metallic state becomes drastically weak, and that only the ∼1.1eV state is seen in the band gap region. Thereafter, the ∼1.1eV state exhibits a clear Ti3p->3d resonance enhancement. The difference in the spectral feature of these band gap states is directly related to the surface geometric structural change.

Original languageEnglish
Pages (from-to)1009-1010
Number of pages2
JournalPhysica C: Superconductivity and its Applications
Issue numberPART 2
Publication statusPublished - 1994 Dec


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