| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Coexistence of Charge Order and Antiferromagnetic Order in an Extended Periodic Anderson Model |
| Yanting Li , Bixia Gao , Qiyu Wang , Juan Zhang , and Qiaoni Chen* |
| Department of Physics, Beijing Normal University, Beijing 100875, China |
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| Cite this article: |
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Yanting Li , Bixia Gao , Qiyu Wang et al 2021 Chin. Phys. Lett. 38 087102 |
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Abstract The competition between the RKKY interaction and the Kondo effect leads to a magnetic phase transition, which occurs ubiquitously in heavy fermion materials. However, there are more and more experimental evidences indicating that the valence fluctuation plays an essential role in the Ce- and Y-based compounds. We study an extended periodic Anderson model (EPAM) which includes the onsite Coulomb repulsion $U_{cf}$ between the localized electrons and conduction electrons. By employing the density matrix embedding theory, we investigate the EPAM in the symmetric case at half filling. By fixing the onsite Coulomb repulsion $U$ of the localized electrons to an intermediate value, the interplay between the RKKY interaction, the Kondo effect and the Coulomb repulsion $U_{cf}$ brings rich physics. We find three different phases, the antiferromagnetic phase, the charge order phase and paramagnetic phase. When the hybridization strength $V$ between the localized orbital and the conduction orbital is small, the Kondo effect is weak so that the AF phase and the CO phase are present. The phase transition between the two long-range ordered phase is of first order. We also find a coexistence region between the two phases. As $V$ increases, the Kondo effect becomes stronger, and the paramagnetic phase appears between the other two phases.
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Received: 02 June 2021
Published: 02 August 2021
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| PACS: |
71.10.-w
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(Theories and models of many-electron systems)
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71.10.Fd
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(Lattice fermion models (Hubbard model, etc.))
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71.10.Hf
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(Non-Fermi-liquid ground states, electron phase diagrams and phase transitions in model systems)
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75.20.Hr
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(Local moment in compounds and alloys; Kondo effect, valence fluctuations, heavy fermions)
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| Fund: Supported by the National Natural Science Foundation of China (Grant Nos. 11974048 and 11974049), and the Beijing Science Foundation (Grant No. 1192011). |
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