Surface states on the LaB6(100), (110) and (111) clean surfaces studied by angle-resolved UPS

R. Nishitani, M. Aono, T. Tanaka, S. Kawai, H. Iwasaki, C. Oshima, S. Nakamura

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    Abstract

    The surface states on the LaB6(100), (110) and (111) clean surfaces have been studied by means of angle-resolved UV photoelectron spectroscopy with unpolarized light. Surface states on LaB6(110) and (111) have been observed for the first time, and the energy-band structures have been determined. The surface states on LaB6(110) are located at ∼1.8 and ∼3.0 eV below EF. They are associated with the occurrence of the c(2 × 2) surface structure on LaB6(110). The surface states on LaB6(111) are located at ∼1.5 and ∼2 eV below EF. The dispersion of the lower band is relatively large (∼0.9 eV) compared with those on LaB6(100) and (110). The surface state at ∼2 eV below EF on LaB6(111) has a maximum energy at Γ point (k∥ = 0), while that on LaB6(100) has a minimum energy at Γpoint. The surface state at ∼2 eV below EFon LaB6(100) possesses Δ1 symmetry at k∥ = 0, and has even parity with respect to the (010) and (011) planes. The surface state at ∼1.8 eV below EF on LaB6(110) has even parity with respect to the (11̄0) plane, and odd parity with respect to the (001) plane. The surface state at ∼3.0 eV below EF has even parity with respect to both the (11̄0) and (001) planes. The low-lying surface state on LaB6(111) has Δ1 symmetry at k∥ = 0. All these surface states on the LaB6 clean surfaces are interpreted in terms of dangling bonds of the surface boron frameworks which are mainly B 2p in character.

    Original languageEnglish
    Pages (from-to)341-358
    Number of pages18
    JournalSurface Science
    Volume95
    Issue number2-3
    DOIs
    Publication statusPublished - 1980 May 2

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    ASJC Scopus subject areas

    • Physical and Theoretical Chemistry
    • Condensed Matter Physics
    • Surfaces and Interfaces

    Cite this

    Nishitani, R., Aono, M., Tanaka, T., Kawai, S., Iwasaki, H., Oshima, C., & Nakamura, S. (1980). Surface states on the LaB6(100), (110) and (111) clean surfaces studied by angle-resolved UPS. Surface Science, 95(2-3), 341-358. https://doi.org/10.1016/0039-6028(80)90181-8