Abstract

By making use of the periodic Anderson model with both the electron-phonon interaction and the transverse hopping, we examine the density of states at zero temperature for strongly correlated d electrons in DCNQI-Cu salt which undergoes a metal-insulator transition followed by three-fold periodicity of both a lattice distortion and a local spin. A slave-boson method is applied to the model expressed in terms of a hole picture in order to treat the local constraint strictly. There are both the coherent (band) component and the incoherent (localized) component in the metallic state. In the insulating state, all the electrons at the site with the local spin are incoherent and a small amount of both components remains at other sites.

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