Superconductivity versus Diagonal Disorder in the (Hard-Core) Boson-Fermion Model |
| G. Pawłowski, S. Robaszkiewicz and R. Micnas
Institute of Physics, A. Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland |
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| The influence of randomness of local pair site energies on superconducting properties of a system of coexisting local pairs and itinerant electrons described by the (hard-core) boson-fermion model is analyzed within variational BCS Hartree-Fock approach. Assuming the rectangular distribution function of the random potential the phase diagrams, critical temperatures, and the chemical potential behaviours are determined. |
| DOI: 10.12693/APhysPolA.106.745 PACS numbers: 71.45.Lr, 71.55.Jv, 74.20.-z |