Theory of unconventional superconductivity in nickelate-based materials

doi:10.1088/1674-1056/ac0bb1

中国物理B ›› 2021, Vol. 30 ›› Issue (10): 108204-108204.doi: 10.1088/1674-1056/ac0bb1

所属专题： SPECIAL TOPIC — Unconventional superconductivity

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

收稿日期:2021-02-26 修回日期:2021-05-30 接受日期:2021-06-16 发布日期:2021-09-30
通讯作者: Huaiming Guo, Fan Yang E-mail:hmguo@buaa.edu.cn;yangfan_blg@bit.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 12074031, 11674025, and 11774019).

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

Received:2021-02-26 Revised:2021-05-30 Accepted:2021-06-16 Published:2021-09-30
Contact: Huaiming Guo, Fan Yang E-mail:hmguo@buaa.edu.cn;yangfan_blg@bit.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 12074031, 11674025, and 11774019).

摘要/Abstract

摘要： 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 d_x²-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 T_c, which is consistent with recent experiments.

关键词: nickelate superconductor, pairing symmetries

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 d_x²-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 T_c, which is consistent with recent experiments.

Key words: nickelate superconductor, pairing symmetries

中图分类号: (Lead-acid, nickel-metal hydride and other batteries)

82.47.Cb

74.78.-w (Superconducting films and low-dimensional structures) 74.25.Dw (Superconductivity phase diagrams)

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[J]. 中国物理B, 2021, 30(10): 108204-108204.

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[J]. Chin. Phys. B, 2021, 30(10): 108204-108204.

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Theory of unconventional superconductivity in nickelate-based materials

Theory of unconventional superconductivity in nickelate-based materials

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