Electron Phase Separations Involving Superconductivity in the Extended Hubbard Models with Pair Hopping Interaction |
| K.J. Kapcia
Electron States of Solids Division, Faculty of Physics, Adam Mickiewicz University in Poznań, Umultowska 85, 61-614 Poznań, Poland |
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| In this work the extended Hubbard models with pair hopping interaction (at the atomic limit) are investigated within the variational approach, which treats the on-site interaction term exactly and the intersite interactions within the mean-field approximation (exact in d → +∞). We analyze mutual stability of the superconducting phase and charge or (ferro/antiferro-)magnetic orderings as well as homogeneous mixed phases. Our preliminary results for U=0 show that the superconducting phase can coexist with the charge or (ferro/antiferro-)magnetic phases only in states with electron phase separation. |
DOI: 10.12693/APhysPolA.127.204 PACS numbers: 71.10.Fd, 74.20.-z, 74.25.Dw, 64.75.Gh, 71.10.Hf |