Intertwined superconductivity and orbital selectivity in a three-orbital Hubbard model for the iron pnictides
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arXiv
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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| author | Marino, Vito Scazzola, Alberto Becca, Federico Capone, Massimo Tocchio, Luca F. |
| author_facet | Marino, Vito Scazzola, Alberto Becca, Federico Capone, Massimo Tocchio, Luca F. |
| contents | We study a three-orbital Hubbard-Kanamori model relevant for iron-based superconductors using variational wave functions explicitly including spatial correlations and electron pairing. We span the nonmagnetic sector from filling $n=4$, which is representative of undoped iron-based superconductors, to $n=3$, where a Mott insulating state with each orbital at half filling is found. In the strong-coupling regime, when the electron density is increased, we find a spontaneous differentiation between the occupation of $d_{xz}$ and $d_{yz}$ orbitals, leading to an orbital-selective state with a nematic character that becomes stronger at increasing density. One of these orbitals stays half-filled for all densities while the other one hosts (together with the $d_{xy}$ orbital) the excess of electron density. Most importantly, in this regime long-range pairing correlations appear in the orbital with the largest occupation. Our results highlight a strong link between orbital-selective correlations, nematicity, and superconductivity, which requires the presence of a significant Hund's coupling. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_13634 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Intertwined superconductivity and orbital selectivity in a three-orbital Hubbard model for the iron pnictides Marino, Vito Scazzola, Alberto Becca, Federico Capone, Massimo Tocchio, Luca F. Strongly Correlated Electrons Superconductivity We study a three-orbital Hubbard-Kanamori model relevant for iron-based superconductors using variational wave functions explicitly including spatial correlations and electron pairing. We span the nonmagnetic sector from filling $n=4$, which is representative of undoped iron-based superconductors, to $n=3$, where a Mott insulating state with each orbital at half filling is found. In the strong-coupling regime, when the electron density is increased, we find a spontaneous differentiation between the occupation of $d_{xz}$ and $d_{yz}$ orbitals, leading to an orbital-selective state with a nematic character that becomes stronger at increasing density. One of these orbitals stays half-filled for all densities while the other one hosts (together with the $d_{xy}$ orbital) the excess of electron density. Most importantly, in this regime long-range pairing correlations appear in the orbital with the largest occupation. Our results highlight a strong link between orbital-selective correlations, nematicity, and superconductivity, which requires the presence of a significant Hund's coupling. |
| title | Intertwined superconductivity and orbital selectivity in a three-orbital Hubbard model for the iron pnictides |
| topic | Strongly Correlated Electrons Superconductivity |
| url | https://arxiv.org/abs/2406.13634 |