Abstract
Abstract : A general solution has been proposed to the problem of resolving the fundamental Fermi surface sections from magnetooscillations in graphite acceptor compounds, allowing quantitative measure of charge transfer and c-axis screening. Direct observation of magnetic breakdown proves that large, in-plane superlattices are responsible for some of the extra oscillation frequencies, while domain formation in Br2-graphite reveals the strong magnetic interaction responsible for other frequencies. X-ray studies show the superlattices directly, and reveal a commensurate-incommensurate transition in H2S04-graphite. In stage-1 AsF5-graphite, a discontinuous change of the magnetooscillations suggests a field-induced phase transition. Negative magnetoresistance in Ca-A1 metallic glasses has been attributed to localization effects. In La-A1 glasses the superconductivity has been used to separate localization and interaction effects in the normal state. In Ge-Fe, the metal-insulator transition shows an unusual dependence on concentration, perhaps related to its magnetic properties, while in Au:Fe, the Kondo effect is found to persist in films 1000A thick.
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