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Spin fluctuations and orbital-selective superconductivity in Ba2CuO4-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 |
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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.
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Received: 08 September 2024
Revised: 28 October 2024
Accepted manuscript online: 30 October 2024
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PACS:
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74.72.-h
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(Cuprate superconductors)
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71.30.+h
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(Metal-insulator transitions and other electronic transitions)
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75.30.Kz
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(Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))
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71.27.+a
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(Strongly correlated electron systems; heavy fermions)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11774350, 11974354, and 11534010). |
Corresponding Authors:
Liang-Jian Zou
E-mail: zou@theory.issp.ac.cn
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Cite this article:
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 Ba2CuO4-y: A FLEX study 2024 Chin. Phys. B 33 127401
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