Dimensional crossover from quasi-2D to 3D superconductivity in (Li,Fe)OHFeSe1-xSx driven by chemical pressure

doi:10.1088/1674-1056/adc404

中国物理B ›› 2025, Vol. 34 ›› Issue (6): 67402-067402.doi: 10.1088/1674-1056/adc404

Dimensional crossover from quasi-2D to 3D superconductivity in (Li,Fe)OHFeSe_1-xS_x driven by chemical pressure

Yuxin Ma(马宇欣)^1,2, Munan Hao(郝木难)², Qi Li(李琦)², Ke Ma(马克)², Haodong Li(李浩东)¹, Duo Zhang(张铎)¹, Ruijin Sun(孙瑞锦)^1,†, Shifeng Jin(金士锋)^2,‡, and Changchun Zhao(赵长春)^1,§

1 School of Science, China University of Geosciences, Beijing (CUGB), Beijing 100083, China;
2 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

收稿日期:2025-01-23 修回日期:2025-03-13 接受日期:2025-03-24 出版日期:2025-05-16 发布日期:2025-05-27
通讯作者: Ruijin Sun, Shifeng Jin, Changchun Zhao E-mail:srj@cugb.edu.cn;shifengjin@iphy.ac.cn;zhaocc@cugb.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 52272268, 52250308, and 52102338), Beijing National Laboratory for Condensed Matter Physics (Grant No. 2024BNLCMPKF016), and Fundamental Research Funding of Universities directly under the Chinese Central Government (Grant No. 2-9-2022-038).

Dimensional crossover from quasi-2D to 3D superconductivity in (Li,Fe)OHFeSe_1-xS_x driven by chemical pressure

1 School of Science, China University of Geosciences, Beijing (CUGB), Beijing 100083, China;
2 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

Received:2025-01-23 Revised:2025-03-13 Accepted:2025-03-24 Online:2025-05-16 Published:2025-05-27
Contact: Ruijin Sun, Shifeng Jin, Changchun Zhao E-mail:srj@cugb.edu.cn;shifengjin@iphy.ac.cn;zhaocc@cugb.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 52272268, 52250308, and 52102338), Beijing National Laboratory for Condensed Matter Physics (Grant No. 2024BNLCMPKF016), and Fundamental Research Funding of Universities directly under the Chinese Central Government (Grant No. 2-9-2022-038).

摘要/Abstract

摘要： The interplay between dimensionality and superconductivity is a central theme in understanding the behavior of low-dimensional superconductors. In this work, we investigate the dimensional crossover from quasi-two-dimensional (quasi-2D) to three-dimensional (3D) superconductivity in (Li,Fe)OHFeSe$_{1-x}$S$_{x}$ single crystals driven by sulfur doping. Through detailed structural, electrical, and magnetic characterization, we identify a critical doping level ($x = 0.53$) where the system transitions from quasi-2D to 3D superconducting behavior. Reduced superconducting fluctuations and non-Fermi liquid behavior near this critical point suggest the presence of competition between intralayer and interlayer pairing mechanisms. Fluctuation conductivity analysis reveals that the coherence length along the $c$-axis, $\zeta_{c}(0)$, and the interlayer coupling strength, $\varGamma $, increase significantly at $x = 0.53$, marking the onset of 3D superconductivity. These findings provide new insights into the role of dimensionality and interlayer coupling in modulating superconducting properties, positioning (Li,Fe)OHFeSe$_{1-x}$S$_{x}$ as a unique platform for exploring crossover physics in iron-based superconductors.

关键词: iron-based superconductor, dimensional crossover, interlayer coupling

Abstract: The interplay between dimensionality and superconductivity is a central theme in understanding the behavior of low-dimensional superconductors. In this work, we investigate the dimensional crossover from quasi-two-dimensional (quasi-2D) to three-dimensional (3D) superconductivity in (Li,Fe)OHFeSe$_{1-x}$S$_{x}$ single crystals driven by sulfur doping. Through detailed structural, electrical, and magnetic characterization, we identify a critical doping level ($x = 0.53$) where the system transitions from quasi-2D to 3D superconducting behavior. Reduced superconducting fluctuations and non-Fermi liquid behavior near this critical point suggest the presence of competition between intralayer and interlayer pairing mechanisms. Fluctuation conductivity analysis reveals that the coherence length along the $c$-axis, $\zeta_{c}(0)$, and the interlayer coupling strength, $\varGamma $, increase significantly at $x = 0.53$, marking the onset of 3D superconductivity. These findings provide new insights into the role of dimensionality and interlayer coupling in modulating superconducting properties, positioning (Li,Fe)OHFeSe$_{1-x}$S$_{x}$ as a unique platform for exploring crossover physics in iron-based superconductors.

Key words: iron-based superconductor, dimensional crossover, interlayer coupling

中图分类号: (Superconducting materials other than cuprates)

74.70.-b

74.70.Xa (Pnictides and chalcogenides)

Yuxin Ma(马宇欣), Munan Hao(郝木难), Qi Li(李琦), Ke Ma(马克), Haodong Li(李浩东), Duo Zhang(张铎), Ruijin Sun(孙瑞锦), Shifeng Jin(金士锋), and Changchun Zhao(赵长春). Dimensional crossover from quasi-2D to 3D superconductivity in (Li,Fe)OHFeSe_1-xS_x driven by chemical pressure[J]. 中国物理B, 2025, 34(6): 67402-067402.

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Dimensional crossover from quasi-2D to 3D superconductivity in (Li,Fe)OHFeSe_1-xS_x driven by chemical pressure

Dimensional crossover from quasi-2D to 3D superconductivity in (Li,Fe)OHFeSe_1-xS_x driven by chemical pressure

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