par Mannheim, Philippe
Référence Physical review. B, Condensed matter, 5, 2, page (745-749)
Publication Publié, 1972
Article révisé par les pairs
Résumé : Some aspects of the crystal impurity problem are again studied. The validity of the cell-model limit of a localized mode is discussed, and the extension of the cell model to nonasymptotic frequencies is presented. The condition M<12M is shown to be sufficient to guarantee localized modes in the presence of mass defects. (The condition M