Spin fluctuations and orbital-selective superconductivity in Ba2CuO4-y: A FLEX study

doi:10.1088/1674-1056/ad8cbe

中国物理B ›› 2024, Vol. 33 ›› Issue (12): 127401-127401.doi: 10.1088/1674-1056/ad8cbe

Spin fluctuations and orbital-selective superconductivity in Ba₂CuO_4-y: A FLEX study

Pei-Jun Zheng(郑裴俊)^1,2, Ya-Min Quan(全亚民)¹, and Liang-Jian Zou(邹良剑)^1,2,†

1 Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China;
2 Science Island Branch of Graduate School, University of Science and Technology of China, Hefei 230026, China

收稿日期:2024-09-08 修回日期:2024-10-28 接受日期:2024-10-30 出版日期:2024-12-15 发布日期:2024-11-21
通讯作者: Liang-Jian Zou E-mail:zou@theory.issp.ac.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11774350, 11974354, and 11534010).

Spin fluctuations and orbital-selective superconductivity in Ba₂CuO_4-y: A FLEX study

Pei-Jun Zheng(郑裴俊)^1,2, Ya-Min Quan(全亚民)¹, and Liang-Jian Zou(邹良剑)^1,2,†

1 Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China;
2 Science Island Branch of Graduate School, University of Science and Technology of China, Hefei 230026, China

Received:2024-09-08 Revised:2024-10-28 Accepted:2024-10-30 Online:2024-12-15 Published:2024-11-21
Contact: Liang-Jian Zou E-mail:zou@theory.issp.ac.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11774350, 11974354, and 11534010).

1. 2024-127401-SI.pdf(4476KB)

摘要/Abstract

摘要： Recently discovered Ba$_2$CuO$_{4-y}$ provides new perspectives to the study of high-temperature superconductivity. Whereas, little is known about the spin dynamics of this material. In this work, we employ the fluctuation exchange (FLEX) approximation within the framework of spin-fluctuation mediated superconductivity to examine the behavior of the spin fluctuations of a two-orbital Hubbard model for Ba$_2$CuO$_{4-y}$. Our calculations reveal an extraordinary spin resonance mode coupled to the superconducting state in the hole-underdoped regime. Furthermore, we confirm that the coupling between the electrons and this resonance mode can lead to a dip-like feature in the electronic spectrum as a feedback effect. In the hole-overdoped regime, by incorporating self energy into our calculations, we obtain orbital-dependent renormalizations and show how these self-energy effects can lead to the detailed gap structures and the orbital-selective superconductivity, which could not be obtained in a previous study using random phase approximation (RPA). This research may shed new light on searching for unconventional superconductors with higher transition temperatures.

关键词: fluctuation exchange approximation, spin fluctuation spectrum, spin resonance peak

Abstract: Recently discovered Ba$_2$CuO$_{4-y}$ provides new perspectives to the study of high-temperature superconductivity. Whereas, little is known about the spin dynamics of this material. In this work, we employ the fluctuation exchange (FLEX) approximation within the framework of spin-fluctuation mediated superconductivity to examine the behavior of the spin fluctuations of a two-orbital Hubbard model for Ba$_2$CuO$_{4-y}$. Our calculations reveal an extraordinary spin resonance mode coupled to the superconducting state in the hole-underdoped regime. Furthermore, we confirm that the coupling between the electrons and this resonance mode can lead to a dip-like feature in the electronic spectrum as a feedback effect. In the hole-overdoped regime, by incorporating self energy into our calculations, we obtain orbital-dependent renormalizations and show how these self-energy effects can lead to the detailed gap structures and the orbital-selective superconductivity, which could not be obtained in a previous study using random phase approximation (RPA). This research may shed new light on searching for unconventional superconductors with higher transition temperatures.

Key words: fluctuation exchange approximation, spin fluctuation spectrum, spin resonance peak

中图分类号: (Cuprate superconductors)

74.72.-h

71.30.+h (Metal-insulator transitions and other electronic transitions) 75.30.Kz (Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)) 71.27.+a (Strongly correlated electron systems; heavy fermions)

Pei-Jun Zheng(郑裴俊), Ya-Min Quan(全亚民), and Liang-Jian Zou(邹良剑). Spin fluctuations and orbital-selective superconductivity in Ba₂CuO_4-y: A FLEX study[J]. 中国物理B, 2024, 33(12): 127401-127401.

Pei-Jun Zheng(郑裴俊), Ya-Min Quan(全亚民), and Liang-Jian Zou(邹良剑). Spin fluctuations and orbital-selective superconductivity in Ba₂CuO_4-y: A FLEX study[J]. Chin. Phys. B, 2024, 33(12): 127401-127401.

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Spin fluctuations and orbital-selective superconductivity in Ba₂CuO_4-y: A FLEX study

Spin fluctuations and orbital-selective superconductivity in Ba₂CuO_4-y: A FLEX study

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