| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Superconductivity and Charge Density Wave in Iodine-Doped CuIr$_{2}$Te$_{4}$ |
| Mebrouka Boubeche1†, Jia Yu2†, Li Chushan2, Wang Huichao2, Lingyong Zeng1, Yiyi He1, Xiaopeng Wang1, Wanzhen Su1, Meng Wang2, Dao-Xin Yao2, Zhijun Wang3,4, and Huixia Luo1* |
1School of Materials Science and Engineering, State Key Laboratory of Optoelectronic Materials and Technologies, and Key Lab of Polymer Composite & Functional Materials, Sun Yat-Sen University, Guangzhou 510275, China
2School of Physics, Sun Yat-Sen University, Guangzhou 510275, China
3Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
4University of Chinese Academy of Sciences, Beijing 100049, China
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| Cite this article: |
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Mebrouka Boubeche, Jia Yu, Li Chushan et al 2021 Chin. Phys. Lett. 38 037401 |
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Abstract We report a systematic investigation on the evolution of the structural and physical properties, including the charge density wave (CDW) and superconductivity of the polycrystalline CuIr$_{2}$Te$_{4- x}$I$_{x}$ for $0.0 \le x \le 1.0$. X-ray diffraction results indicate that both of $a$ and $c$ lattice parameters increase linearly when $0.0 \le x \le 1.0$. The resistivity measurements indicate that the CDW is destabilized with slight $x$ but reappears at $x \ge 0.9$ with very high $T_{\rm CDW}$. Meanwhile, the superconducting transition temperature $T_{\rm c}$ enhances as $x$ increases and reaches a maximum value of around 2.95 K for the optimal composition CuIr$_{2}$Te$_{1.9}$I$_{0.1}$ followed by a slight decrease with higher iodine doping content. The specific heat jump ($\Delta C/\gamma T_{\rm c}$) for the optimal composition CuIr$_{2}$Te$_{3.9}$I$_{0.1}$ is approximately 1.46, which is close to the Bardeen–Cooper–Schrieffer value of 1.43, indicating that it is a bulk superconductor. The results of thermodynamic heat capacity measurements under different magnetic fields [$C_{\rm p}(T, H)$], magnetization $M(T, H)$ and magneto-transport $\rho (T, H)$ measurements further suggest that CuIr$_{2}$Te$_{4- x}$I$_{x}$ bulks are type-II superconductors. Finally, an electronic phase diagram for this CuIr$_{2}$Te$_{4- x}$I$_{x}$ system has been constructed. The present study provides a suitable material platform for further investigation of the interplay of the CDW and superconductivity.
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Received: 25 November 2020
Published: 02 March 2021
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| PACS: |
74.25.-q
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(Properties of superconductors)
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74.25.Dw
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(Superconductivity phase diagrams)
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74.25.F-
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(Transport properties)
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74.70.Xa
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(Pnictides and chalcogenides)
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| Fund: Supported by the National Natural Science Foundation of China (Grants No. 11922415), the Guangdong Basic and Applied Basic Research Foundation (Grants No. 2019A1515011718), the Fundamental Research Funds for the Central Universities (Grants No. 19lgzd03), the Key R&D Program of Guangdong Province, China (Grants No. 2019B110209003), and the Pearl River Scholarship Program of Guangdong Province Universities and Colleges (Grants No. 20191001). H.C. Wang was supported by the National Natural Science Foundation of China (Grant No. 12004441), the Hundreds of Talents Program of Sun Yat-Sen University and the Fundamental Research Funds for the Central Universities (Grants No. 20lgpy165). D.X. Yao was supported by the National Natural Science Foundation of China (Grant No. 11974432), NKRDPC-2017YFA0206203, and NKRDPC-2018YFA0306001. M. Wang was supported by the National Nature Science Foundation of China (11904414), the Natural Science Foundation of Guangdong (2018A030313055), and National Key Research and Development Program of China (Grants No. 2019YFA0705700). |
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