We have performed UV and X-ray angle-resolved photoemission spectroscopy (ARPES) on AlB2 which is a non-superconducting reference of MgB 2. We found that the \sigma-band is totally occupied in AlB 2 in contrast to the partially occupied \sigma-band in MgB 2, which suggests that the \sigma-band on the Fermi level is essential for the superconductivity. We also found an electron pocket centered at the Γ (A) point in the UVARPES spectrum as in MgB2, while it is absent in the X-ray ARPES spectra. This indicates that the electron pocket is of surface origin.
|ジャーナル||Journal of Electron Spectroscopy and Related Phenomena|
|出版ステータス||Published - 2005 6|
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