Possible High T_{c} Superconductivity in La_{3}Ni_{2}O_{7} under High Pressure through Manifestation of a Nearly Half-Filled Bilayer Hubbard Model.
Possible High T_{c} Superconductivity in La_{3}Ni_{2}O_{7} under High Pressure through Manifestation of a Nearly Half-Filled Bilayer Hubbard Model.
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DOI：
10.1103/physrevlett.132.106002
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发表时间：
2023-06
影响因子：
8.6
通讯作者：
H. Sakakibara;Naoya Kitamine;M. Ochi;K. Kuroki
中科院分区：
文献类型：
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作者：
H. Sakakibara;Naoya Kitamine;M. Ochi;K. Kuroki
受最近实验表明La_{3}Ni_{2}O_{7}在高压下表现出高T_{c}超导性的启发，我们从理论上重新审视了这种材料超导的可能性。我们发现可以发生超导，这有点类似于由 Ni 3d_{3z^{2}-r^{2}} 轨道组成的双层哈伯德模型。尽管与 3d_{x^{2}-y^{2}} 轨道的耦合会降低超导性，但由于双层哈伯德模型中达到的非常高的 T_{c}，T_{c} 仍然足够高以理解实验。
Inspired by a recent experiment showing that La_{3}Ni_{2}O_{7} exhibits high T_{c} superconductivity under high pressure, we theoretically revisit the possibility of superconductivity in this material. We find that superconductivity can take place, which is somewhat similar to that of the bilayer Hubbard model consisting of the Ni 3d_{3z^{2}-r^{2}} orbitals. Although the coupling with the 3d_{x^{2}-y^{2}} orbitals degrades superconductivity, T_{c} can still be high enough to understand the experiment thanks to the very high T_{c} reached in the bilayer Hubbard model.