Superconductivity, Charge Density Wave and Charge Kondo States in Systems of Coexisting Itinerant Electrons and Local Pairs |
| M. Sidowski and S. Robaszkiewicz
Institute of Physics, A. Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland |
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| Received: 25 09 2005; |
| The properties of a system of coexisting local pairs and itinerant electrons described by the (hard-core) boson-fermion model are discussed. For the first time we include into analysis of the model not only the superconducting and non-ordered (normal) states but also the charge density wave phases as well as the so-called charge Kondo state. Within an extended mean-field approximation, a mutual stability of charge density wave, superconducting and charge Kondo states are determined at T = 0 in the case of half-filled fermionic and bosonic bands. |
| DOI: 10.12693/APhysPolA.109.647 PACS numbers: 74.20.Mn, 74.20.-z, 75.30.Mb, 71.45.Lr |