title: Structure-induced covalent bonding in Al-Li compounds.
abstract: Formation mechanism of a deep pseudogap in the electronic density of states of the Al-Li Bergman and Zintl compounds is discussed with an emphasis on the differences among isostructural Al-Mg compounds. Since Li scatters electrons very weakly in comparison with Al and Mg, the potential landscape for electrons in Al-Li compounds is not that of the entire close-packed structure but that of the Al sublattice, which is a rather porous network like the diamond lattice. The porous network structure realized by the chemical decoration of close-packed structures enhances the covalent nature of electronic structures, hence the deep pseudogap in the electronic density of states. A concept of structure-induced covalent bonding in a network realized by the chemical decoration of close-packed structures may provide a novel picture in the electronic structures of complex intermetallic compounds.
authors.affiliation: Graduate School of Material Science, University of Hyogo, Kamigori, Hyogo 678-1297, Japan.
authors.forename: Kazuki
authors.initials: K
authors.lastname: Nozawa
authors.forename: Yasushi
authors.initials: Y
authors.lastname: Ishii