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Surface enhanced covalency and its effect on the surface states ofd-band metal oxides

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Abstract

The effect of electron-electron interactions on the surface states of ionicd-band oxides is reported. The local density of states of surface cations in the valence band region is significantly increased when surface states occur in the band gap. Coulomb repulsion associated with thissurface enhanced covalency tends to force surface states out of the band gap. These results suggest an explanation of recent experiments on SrTiO3 and TiO2.

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References

  1. 1.

    P.E.Emmet, P.Sabatier, E.E.Reid:Catalysis Then and Now (Franklin Publishing Co. Inc., 1965)

  2. 2.

    A.Fujishima, K.Honda: Nature238, 37 (1972)

  3. 3.

    J.G.Mavroides, D.I.Tchernev, J.A.Kafalas, D.F.Kolesar: Mat. Res. Bull.10, 1023 (1975); J.G.Mavroides, J.A.Kafalas, D.F.Kolesar: Appl.P Phys. Lett.28, 241 (1976)

  4. 4.

    T.Wolfram, E.A.Kraut, F.J.Morin: Phys. Rev. B7, 1677 (1973)

  5. 5.

    F.J.Morin, T.Wolfram: Phys. Rev. Lett.30, 1214 (1973)

  6. 6.

    T.Wolfram: Phys. Rev. Lett.29, 1383 (1972)

  7. 7.

    R.A.Powell, W.E.Spicer: Phys. Rev. B13, 2601 (1976)

  8. 8.

    V.E.Henrich, G.Dresselhaus, H.J.Zeiger: Phys. Rev. Lett.36, 1335 (1976); also in “Electrocatalysis on Non-Metallic Surfaces”, Natl. Bur. Stds. Special Publication (U.S. GPO,Wash.D.C., to be published)

  9. 9.

    V.E.Henrich, G.Dresselhaus, H.J.Zeiger: Solid State Res. Report, Lincoln Laboratory, M.I.T. (1976:2); V.E.Henrich (private communication)

  10. 10.

    P.W.Anderson: Phys. Rev.124, 41 (1961)

  11. 11.

    E.A.Kraut, T.Wolfram, W.F.Hall: Phys. Rev. B6, 1499 (1972)

  12. 12.

    The change in the Madelung potential involves sums over both anion and cation charges. Charge neutrality imposes a proportionality between the changes in the cation and anion charges so that the effect is approximately proportional to Δn d

  13. 13.

    C.E.Moore:Atomic Energy Levels, Natl. Bur. Std. Crc467 (U.S. GPO, Wash. D.C., 1958) Vol. III

  14. 14.

    C.Herring: InMagnetism, Vol. IV, ed. by G.T.Radoand H.Suhl (Academic Press, New York 1966) pp. 190–198

  15. 15.

    D.F.Eastman, J.L.Freeouf: Phys. Rev. Lett.33, 1601 (1974)

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Wolfram, T., Ellialtioğlu, Ş. Surface enhanced covalency and its effect on the surface states ofd-band metal oxides. Appl. Phys. 13, 21–24 (1977). https://doi.org/10.1007/BF00890714

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PACS Code

  • 82.65