Effects of carrier density and interactions on pairing symmetry in a t2g model

doi:10.1088/1674-1056/ad1094

中国物理B ›› 2024, Vol. 33 ›› Issue (1): 17404-17404.doi: 10.1088/1674-1056/ad1094

Effects of carrier density and interactions on pairing symmetry in a t_2g model

Yun-Xiao Li(李云霄)¹, Wen-Han Xi(西文翰)¹, Zhao-Yang Dong(董召阳)², Zi-Jian Yao(姚子健)³, Shun-Li Yu(于顺利)^1,4,†, and Jian-Xin Li(李建新)^1,4,‡

1 National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China;
2 Nanjing University of Science and Technology, Nanjing 210094, China;
3 Department of Physics, Nanjing Normal University, Nanjing 210023, China;
4 Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China

收稿日期:2023-10-21 修回日期:2023-11-16 接受日期:2023-11-29 出版日期:2023-12-13 发布日期:2023-12-25
通讯作者: Shun-Li Yu, Jian-Xin Li E-mail:slyu@nju.edu.cn;jxli@nju.edu.cn
基金资助:
Project supported by the National Key Research and Development Program of China (Grant No. 2021YFA1400400) and the National Natural Science Foundation of China (Grant Nos. 92165205, 12074175, and 12374137).

Effects of carrier density and interactions on pairing symmetry in a t_2g model

Yun-Xiao Li(李云霄)¹, Wen-Han Xi(西文翰)¹, Zhao-Yang Dong(董召阳)², Zi-Jian Yao(姚子健)³, Shun-Li Yu(于顺利)^1,4,†, and Jian-Xin Li(李建新)^1,4,‡

1 National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China;
2 Nanjing University of Science and Technology, Nanjing 210094, China;
3 Department of Physics, Nanjing Normal University, Nanjing 210023, China;
4 Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China

Received:2023-10-21 Revised:2023-11-16 Accepted:2023-11-29 Online:2023-12-13 Published:2023-12-25
Contact: Shun-Li Yu, Jian-Xin Li E-mail:slyu@nju.edu.cn;jxli@nju.edu.cn
Supported by:
Project supported by the National Key Research and Development Program of China (Grant No. 2021YFA1400400) and the National Natural Science Foundation of China (Grant Nos. 92165205, 12074175, and 12374137).

摘要/Abstract

摘要： By utilizing the fluctuation exchange approximation method, we perform a study on the superconducting pairing symmetry in a t_2g three-orbital model on the square lattice. Although the tight-binding parameters of the model are based on Sr₂RuO₄, we have systematically studied the evolution of superconducting pairing symmetry with the carrier density and interactions, making our findings relevant to a broader range of material systems. Under a moderate Hund's coupling, we find that spin fluctuations dominate the superconducting pairing, leading to a prevalent spin-singlet pairing with a d_x²-y²-wave symmetry for the carrier density within the range of n=1.5—4 per site. By reducing the Hund's coupling, the charge fluctuations are enhanced and play a crucial role in determining the pairing symmetry, leading to a transition of the pairing symmetry from the spin-singlet d_x²-y²-wave to the spin-triplet p-wave. Furthermore, we find that the superconducting pairings are orbital dependent. As the carrier density changes from n=4 to n=1.5, the active orbitals for superconducting pairing shift from the quasi-two-dimensional orbital d_xy to the quasi-one-dimensional orbitals d_xz and d_yz.

关键词: unconventional superconductivity, pairing mechanism, Fermi surface, three-orbital model

Abstract: By utilizing the fluctuation exchange approximation method, we perform a study on the superconducting pairing symmetry in a t_2g three-orbital model on the square lattice. Although the tight-binding parameters of the model are based on Sr₂RuO₄, we have systematically studied the evolution of superconducting pairing symmetry with the carrier density and interactions, making our findings relevant to a broader range of material systems. Under a moderate Hund's coupling, we find that spin fluctuations dominate the superconducting pairing, leading to a prevalent spin-singlet pairing with a d_x²-y²-wave symmetry for the carrier density within the range of n=1.5—4 per site. By reducing the Hund's coupling, the charge fluctuations are enhanced and play a crucial role in determining the pairing symmetry, leading to a transition of the pairing symmetry from the spin-singlet d_x²-y²-wave to the spin-triplet p-wave. Furthermore, we find that the superconducting pairings are orbital dependent. As the carrier density changes from n=4 to n=1.5, the active orbitals for superconducting pairing shift from the quasi-two-dimensional orbital d_xy to the quasi-one-dimensional orbitals d_xz and d_yz.

Key words: unconventional superconductivity, pairing mechanism, Fermi surface, three-orbital model

中图分类号: (Theories and models of superconducting state)

74.20.-z

74.20.Rp (Pairing symmetries (other than s-wave)) 71.18.+y (Fermi surface: calculations and measurements; effective mass, g factor) 75.10.Lp (Band and itinerant models)

Yun-Xiao Li(李云霄), Wen-Han Xi(西文翰), Zhao-Yang Dong(董召阳), Zi-Jian Yao(姚子健), Shun-Li Yu(于顺利), and Jian-Xin Li(李建新). Effects of carrier density and interactions on pairing symmetry in a t_2g model[J]. 中国物理B, 2024, 33(1): 17404-17404.

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Effects of carrier density and interactions on pairing symmetry in a t_2g model

Effects of carrier density and interactions on pairing symmetry in a t_2g model

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