Physics – Condensed Matter – Superconductivity
Scientific paper
2011-08-30
Physics
Condensed Matter
Superconductivity
4 pages, 4 figures. Additional references are added
Scientific paper
Motivated by the recent discovery of Fe-based superconductors close to an antiferromagnetic insulator in the experimental phase diagram, here the five-orbital Hubbard model (without lattice distortions) is studied using the real-space Hartree-Fock approximation, employing a 10x10 Fe cluster with Fe vacancies in a $\sqrt{5}x\sqrt{5}$ pattern. Varying the Hubbard and Hund couplings, and at electronic density $n$=6.0, the phase diagram contains an insulating state with the same spin pattern as observed experimentally, involving 2x2 ferromagnetic plaquettes coupled with one another antiferromagnetically. The presence of local ferromagnetic tendencies is in qualitative agreement with Lanczos results for the three-orbital model also reported here. The magnetic moment ~ 3$\mu_B$/Fe is in good agreement with experiments. Several other phases are also stabilized in the phase diagram, in agreement with recent calculations using phenomenological models.
Dagotto Elbio
Luo Qinlong
Moreo Adriana
Nicholson Andrew
Riera Jose
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