Abstract
Recently, a bulk nickelate superconductor La3Ni2O7 is discovered at pressures with a remarkable high transition temperature Tc ∼ 80 K. Here, we study a Hubbard model with tight-binding parameters derived from ab initio calculations of La3Ni2O7, by employing large scale determinant quantum Monte Carlo and cellular dynamical mean-field theory. Our result suggests that the superexchange couplings in this system are comparable to that of cuprates. The system is a charge transfer insulator as the hole concentration becomes four per site at large Hubbard U. Upon hole doping, two low-energy spin-singlet bands emerge in the system exhibiting distinct correlation properties: while the one composed of the out-of-plane \(\text{Ni-}d_{3z^{2}-r^{2}}\) and O-pz orbitals demonstrates strong antiferromagnetic correlations and narrow effective bandwidth, the in-plane singlet band consisting of the \(\text{Ni-}d_{x^{2}-y^{2}}\) and O-px/py orbitals is in general more itinerant. Over a broad range of hole doping, the doped holes occupy primarily the \(d_{x^{2}-y^{2}}\) and px/py orbitals, whereas the \(d_{3z^{2}-r^{2}}\) and pz orbitals retain underdoped. We propose an effective t-J model to capture the relevant physics and discuss the implications of our result for comprehending the La3Ni2O7 superconductivity.
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We thank Hualei Sun, Mi Jiang, K. Le Hur, Yi Lu, and Xunwu Hu for useful discussions. Wéi Wú is indebted to A.-M. Tremblay for useful discussions and insightful suggestions. Wéi Wú acknowledges help from Dong Meng in preparing the illustrations in Figure 1. Work at Sun Yat-sen University was supported by the National Natural Science Foundation of China (Grant Nos. 12274472, 92165204, 12174454, and 11974432), the National Key Research and Development Program of China (Grant Nos. 2022YFA1402802, and 2018YFA0306001), the Guangdong Basic and Applied Basic Research Foundation (Grant Nos. 2022A1515011618, and 2021B1515120015), the Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices (Grant No. 2022B1212010008), the Shenzhen International Quantum Academy (Grant No. SIQA202102), and the Leading Talent Program of Guangdong Special Projects (Grant No. 201626003). We acknowledge the support from GuangZhou National Supercomputing Center (Tianhe-II).
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Wú, W., Luo, Z., Yao, DX. et al. Superexchange and charge transfer in the nickelate superconductor La3Ni2O7 under pressure. Sci. China Phys. Mech. Astron. 67, 117402 (2024). https://doi.org/10.1007/s11433-023-2300-4
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DOI: https://doi.org/10.1007/s11433-023-2300-4