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Special Issue:
SPECIAL TOPIC — Unconventional superconductivity
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| SPECIAL TOPIC—Unconventional superconductivity |
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Theory of unconventional superconductivity in nickelate-based materials |
| Ming Zhang(张铭)1, Yu Zhang(张渝)2, Huaiming Guo(郭怀明)3,†, and Fan Yang(杨帆)1,‡ |
1 School of Physics, Beijing Institute of Technology, Beijing 100081, China;
2 Institute for Quantum Science and Engineering and Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China;
3 School of Physics, Beihang University, Beijing 100191, China |
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Abstract Based on the two-band tight-binding model composed of the 3d orbital of Ni and the 5d orbital of R (=La), we used the random-phase-approximation method to study the pairing symmetry of the nickelate superconductors. It is found that even without considering the coupling between the R and Ni orbitals, neither the antiferromagnetic spin-fluctuation pattern nor the doping-dependent behavior of the robust dx2-y2-wave pairing state obtained in our calculations will be obviously influenced. Our results suggest the dominating role of the Ni 3d orbital in determining the low lying physics of the system. Furthermore, our results reveal a dome-shaped doping dependence of the superconducting transition temperature Tc, which is consistent with recent experiments.
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Received: 26 February 2021
Revised: 30 May 2021
Accepted manuscript online: 16 June 2021
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PACS:
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82.47.Cb
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(Lead-acid, nickel-metal hydride and other batteries)
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74.78.-w
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(Superconducting films and low-dimensional structures)
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74.25.Dw
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(Superconductivity phase diagrams)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 12074031, 11674025, and 11774019). |
Corresponding Authors:
Huaiming Guo, Fan Yang
E-mail: hmguo@buaa.edu.cn;yangfan_blg@bit.edu.cn
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Cite this article:
Ming Zhang(张铭), Yu Zhang(张渝), Huaiming Guo(郭怀明), and Fan Yang(杨帆) Theory of unconventional superconductivity in nickelate-based materials 2021 Chin. Phys. B 30 108204
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