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Lithium-intercalation-induced structural evolution and superconductivity modulation in 2H-LixTaSe2 |
| Lijia Zhou(周立佳)1, Xiangjiang Dong(董祥江)2, Qiang Li(李强)1, Xiaojun Kuang(匡小军)3, and Xianran Xing(邢献然)1,† |
1 Beijing Advanced Innovation Center for Materials Genome Engineering and Institute of Solid-State Chemistry, University of Science and Technology Beijing, Beijing 100083, China;
2 Center for High-Pressure Science and Technology Advanced Research, Beijing 100093, China;
3 Guangxi Key Laboratory of Electrochemical and Magnetochemical Functional Materials, College of Chemistry and Bioengineering, Guilin University of Technology, Guilin 541004, China |
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Abstract We systematically investigated the structural and superconducting properties of polycrystalline 2H-Li$_{x}$TaSe$_{2}$ ($0.1 \le x \le 1.0$) synthesized via a high-temperature solid-state reaction. Lithium (Li) intercalation induces an expansion along the $c$-axis and intralayer distortions within the Ta—Se coordination network. The superconducting transition temperature ($T_{\rm c}$) is increased to 2.95 K at $x = 0.1$ driven by the synergistic enhancement of the electronic density of states at the Fermi level, $N(E_{\rm F})$, and strengthened electron—phonon coupling. With further Li doping, although $N(E_{\rm F})$ continues to increase, lattice stiffening and pronounced distortions in the Ta—Se coordination polyhedra weaken the electron—phonon interaction, ultimately suppressing superconductivity. These findings highlight the critical role of intralayer structural modulation in governing structure-tunable superconductivity in layered materials.
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Received: 06 May 2025
Revised: 29 May 2025
Accepted manuscript online: 09 June 2025
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PACS:
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74.70.Ad
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(Metals; alloys and binary compounds)
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74.62.Bf
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(Effects of material synthesis, crystal structure, and chemical composition)
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74.25.Dw
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(Superconductivity phase diagrams)
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| Fund: This research was supported by the National Natural Science Foundation of China (Grant Nos. 22090042 and 22175018). |
Corresponding Authors:
Xianran Xing
E-mail: xing@ustb.edu.cn
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Cite this article:
Lijia Zhou(周立佳), Xiangjiang Dong(董祥江), Qiang Li(李强), Xiaojun Kuang(匡小军), and Xianran Xing(邢献然) Lithium-intercalation-induced structural evolution and superconductivity modulation in 2H-LixTaSe2 2025 Chin. Phys. B 34 117402
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