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SCRIPTA MATERIALIA · 2019 · IF 4.539

The effect of S doping on the superconductivity and nematicity transition of FeSe

Qingshuang Ma,Feng Lan,Xinhua Li,Zunfeng Du,Huijun Li,Zongqing Ma

In this work, the superconducting properties of FeSe 1−x S x with 0 ≤  x  ≤ 0.5 were studied. With S doping, T c is enhanced and shows a dome shape in the studied composition range. XRD measurements demonstrate that S substituting Se sites introduces positive chemical pressure, which can suppress the orbital ordering, manifesting as the decrease of T s . Hall measurements demonstrate that S doping can effectively tune the charge carriers and make hole-type carriers predominant. However, no maxing T c is obtained as T s vanishes in FeSe 0.7 S 0.3 , indicating the nematic order has no universal influence on the superconductivity of FeSe system.

研究领域: 凝聚态物理 · 材料科学 · 低温物理学 · 强关联电子系统

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ACS Nano · 2025 · IF 16

Filling-Dependent Intertwined Electronic and Atomic Orders in the Flat-Band State of 1T-TaS2

Yanyan Geng,Haoyu Dong,Renhong Wang,Jianfeng Guo,Shuo Mi,Le Lei,Yan Li,Li Huang,Fei Pang,Rui Xu,Weiqiang Yu,Hong-Jun Gao,Wei Ji,Weichang Zhou,Zhihai Cheng

The delicate interplay among the complex intra/inter-layer electron–electron and electron–lattice interactions is the fundamental prerequisite of these exotic quantum states, such as superconductivity, nematic order, and checkerboard charge order. Here, we explore the filling-dependent multiple stable intertwined electronic and atomic orders of the flat-band state of 1T-TaS2 encompassing hole order, phase orders, coexisting left- and right-chiral orders, and mixed phase/chiral orders via scanning tunneling microscopy (STM). Combining first-principles calculations, the emergent electronic/atomic orders can be attributed to the weakening of electron–electron correlations and stacking-dependent interlayer interactions. Moreover, achiral intermediate ring-like clusters and nematic charge density wave (CDW) states are successfully realized in intralayer chiral domain wall and interlayer heterochiral stacking regions through chiral overlap configurations. Our study not only deepens the understanding of filling-dependent electronic/atomic orders in flat-band systems but also offers perspectives for exploring exotic quantum states in correlated electronic systems.

CAS / MDL: 7704-34-9 7721-01-9

研究领域: 凝聚态物理 · 强关联电子系统 · 量子材料 · 表面科学 · 电子结构理论

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The effect of S doping on the superconductivity and nematicity transition of FeSe

Filling-Dependent Intertwined Electronic and Atomic Orders in the Flat-Band State of 1T-TaS2