The Electronic Properties of a Simple Metal-Metal Interface.
Final rept. 31 Oct 76-1 Nov 77,
CALIFORNIA UNIV SAN DIEGO LA JOLLA DEPT OF PHYSICS
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The properties of metal-metal interfaces are of interest in many metallurgical applications. These include grain boundaries, crack growth, friction and bi-metallic adhesion. The present work is a study of the electronic properties of a simple bimetallic junction. The methods employed to investigate the interface are the Greens function technique and the phase shifts method. Greens function of a simple junction within the tight-binding approximation is calculated. The conditions for the occurrance of bound states is deduced from the poles of the Greens function. It is shown that there are three types of wave functions associated with the interface. The first extends throughout the entire cyrstal, the second extends on one side of the interface only, whereas the third kind is localized near the interface. Using the phase shifts method an expression for the change in density of states due to the creation of the interface is derived. From this expression the corresponding single-particle contribution to the interface energy and the interface specific heat is derived.
- Metallurgy and Metallography
- Solid State Physics