Electron-Phonon Interactions and Phase Transitions W. Vogel & M. Büttner GmbH and Policy (TEP) in the

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Electron-Phonon Interactions and Phase Transitions W. Vogel & M. Büttner GmbH and Policy (TEP) in theThis NATO Advanced Study Institute was the fourth in a series devoted to the subject of phase transitions and instabilities with particular attention to structural phase transforma~ions. Beginning wi th the first Geilo institute in 19'(1 we have seen the emphasis evolve from the simple quasiharmonic soft mode description within the Landau theory, through the unexpected spectral structure re presented by the "central peak" (1973), to such subjects as