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Electronic structure of disordered alloys: Optical and photoemission measurements on Ag-Au and Cu-Au alloys

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Physik der kondensierten Materie

Abstract

Optical and photoemission measurements on Ag-Au and Cu-Au alloys over the whole composition range are reported. It is found that for these alloys, which represent the situation in many binary alloy systems, neither the commonly used virtual crystal model (and thus not that of the rigid band), nor the independent band model describes the observed results. Calculations in the recently developed coherent potential approximation however reproduce the main features of the observed density of states for the alloys.

Zusammenfassung

Optische Messungen und Photoemissionsuntersuchungen sind an Ag-Au und Cu-Au Legierungen aller Zusammensetzungen vorgenommen worden. Es wurde festgestellt, daß für diese Legierungen, die die Situation in vielen binären Systemen darstellen, weder das auf virtuellem Kristall gegründete Modell (und also nicht das auf festem Band gegründete), noch dasjenige unabhängiger Bänder die beobachteten Ergebnisse beschreiben kann. Berechnungen mit der neulich entwickelten Koherentpotential-Annäherung wiedergeben jedoch die wichtigsten Züge der beobachteten Zustandsdichte für die Legierungen.

Résumé

Des mesures optiques et photo-émissives ont été faites sur les alliages Ag-Au et Cu-Au dans la gamme entière de compositions. On a trouvé que pour ces alliages, représentatifs de la situation dans nombreux systèmes binaires, ni le modèle de cristal virtuel (et, par conséquence, celui de bande rigide non plus) ni celui de bandes indépendentes peut décrire les resultats obténus. Pourtant, des calculs dans l’approximation récemment dévélopée de potentiel cohérent reproduissent les traits principaux de la densité d’états observée pour les alliages.

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  1. Department of Physics, Chalmers University of Technology, Gothenburg, Sweden

    P. O. Nilsson

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Nilsson, P.O. Electronic structure of disordered alloys: Optical and photoemission measurements on Ag-Au and Cu-Au alloys. Phys kondens Materie 11, 1–18 (1970). https://doi.org/10.1007/BF02422633

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