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Possible high T_c Superconductivity in La₃Ni₂O₇ under High Pressure through Manifestation of a Nearly-Half-Filled Bilayer Hubbard Model
Hirofumi Sakakibara, Naoya Kitamine, Masayuki Ochi, Kazuhiko Kuroki
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Inspired by a recent experiment showing that La₃Ni₂O₇ 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 essentially similar to that of the bilayer Hubbard model consisting of the Ni 3d_(3z²-r²) orbitals. Although the coupling with the 3d_(x²-y²) 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.
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