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