A CRITERION FOR TWO KINDS OF PEIERLS TRANSITIONS
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Abstract
Two different kinds of Peierls transitions can exist depending on the anisotropic ratio y of intrachain and interchain coupling. γ has a critical value γo; if γ > γo, the Peierls transition will exhibit a CDW accompanied by a metal-semiconductor transition (kind I); if γγo, only CDW and superlattice occur at Peierls transition (kind II). Some experimental evidences are discussed.
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