Critical Values for Electron Pairing in t-U-J-V and t-J-V Models |
| M. Bak
Institute of Physics, A. Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland |
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| Received: 6 11 2007; |
| The critical values for pairing of s*- and d-wave symmetry are calculated within the t-U-J-V and the t-J-V models in renormalized mean field theory. It is shown that the first model yields the proper critical values in the low density limit while the other does not. Renormalized mean field theory strongly decreases the absolute value of (negative) critical values for larger electron densities. |
| DOI: 10.12693/APhysPolA.114.275 PACS numbers: 74.20.-z, 74.20.Fg, 74.20.Rp, 74.25.Dw, 71.10.Fd, 71.27.+a |