From tilings to coverings

Article Abstract:

Paul Steinhardt and colleagues have reported on new electron microscope data that supports a simple answer to the question why atoms form in complex patterns instead of in a regularly repeating periodic crystal. They demonstrate the existence of Gummelt's decagonal coverage in nature using the high-angle annular dark-field technique. The decorated decagon is named a 'quasi-unit cell'.

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Quasicrystalline valence bands in decagonal AlNiCo

Article Abstract:

Research is presented concerning the electronic bandstructure of quasicrystals. Experimentation on decagonal Al71.8Ni14.8Co13.4 in order to investigate the angle-resolved photoemissions is discussed.

Photoemission, Letter to the Editor, Alloys, Valence, Valence (Chemistry)

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Electrons in a strange sea

Article Abstract:

Issues are presented concerning the factors which affect the movement of electrons in metals. The different construction of the atoms within quasicrystals is discussed.

Electric conductors

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