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Entropy and electronic orders of the three-orbital Hubbard model with antiferromagnetic Hund coupling | | Changming Yue
; Shintaro Hoshino
; Philipp Werner
; | | Date: |
9 Jul 2020 | | Abstract: | An antiferromagnetic Hund coupling in multiorbital Hubbard systems induces
orbital freezing and an associated superconducting instability, as well as
unique composite orders in the case of an odd number of orbitals. While the
rich phase diagram of the half-filled three-orbital model has recently been
explored in detail, the properties of the doped system remain to be clarified.
Here, we complement the previous studies by computing the entropy of the
half-filled model, which exhibits an increase in the orbital-frozen region, and
a suppression in the composite ordered phase. The doping dependent phase
diagram shows that the composite ordered state can be stabilized in the doped
Mott regime, if conventional electronic orders are suppressed by frustration.
While antiferro orbital order dominates the filling range $2lesssim n le 3$,
and ferro orbital order the strongly interacting region for $1lesssim n < 2$,
we find superconductivity with a remarkably high $T_c$ around $n=1.5$ (quarter
filling). Also in the doped system, there is a close connection between the
orbital freezing crossover and superconductivity. | | Source: | arXiv, 2007.5054 | | Services: | Forum | Review | PDF | Favorites | |
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