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Electronic valence bands in decagonal Al-Ni-Co

Physical Review B 68(10): 104205

Autoren/Herausgeber: Theis W
Rotenberg E
Franke KJ
Gille P
Horn K
Erschienen: 2003

Valence-band photoemission from the s-p region of the tenfold and the two inequivalent twofold surfaces of quasicrystalline decagonal Al71.8Ni14.8Co13.4 reveals strongly dispersing bands. These exhibit a free-electron-like dispersion along quasiperiodic and periodic directions of the decagonal quasicrystal. The experimental photoemission maps are reproduced in detail by a model in which parabolic bands emanate from a set of reciprocal lattice vectors. A parity rule for the principal zone centers is observed.

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