中国物理B ›› 2022, Vol. 31 ›› Issue (3): 37406-037406.doi: 10.1088/1674-1056/ac43b1

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Superconductivity in CuIr2-xAlxTe4 telluride chalcogenides

Dong Yan(严冬)1,5,†, Lingyong Zeng(曾令勇)1,†, Yijie Zeng(曾宜杰)2,6, Yishi Lin(林一石)3,4, Junjie Yin(殷俊杰)2, Meng Wang(王猛)2, Yihua Wang(王熠华)3,4, Daoxin Yao(姚道新)2, and Huixia Luo(罗惠霞)1,‡   

  1. 1 School of Materials Science and Engineering, State Key Laboratory of Optoelectronic Materials and Technologies, Key aboratory of Polymer Composite&Functional Materials, Guangzhou Key Laboratory of Flexible Electronic Materials and Wearable Devices, Sun Yat-Sen University, Guangzhou 510275, China;
    2 Center for Neuron Science and Technology, School of Physics, Sun Yat-Sen University, Guangzhou 510275, China;
    3 State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China;
    4 Shanghai Research Center for Quantum Sciences, Shanghai 201315, China;
    5 Key Laboratory of Functional Molecular Solids, Ministry of Education, College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241002, China;
    6 College of Science, Hangzhou Dianzi University, Hangzhou 310018, China
  • 收稿日期:2021-11-16 修回日期:2021-12-10 接受日期:2021-12-16 出版日期:2022-02-22 发布日期:2022-02-24
  • 通讯作者: Huixia Luo E-mail:luohx7@mail.sysu.edu.cn
  • 基金资助:
    H. X. Luo acknowledges the financial support by the National Natural Science Foundation of China (Grant No. 11922415), Guangdong Basic and Applied Basic Research Foundation, China (Grants No. 2019A1515011718), and the Pearl River Scholarship Program of Guangdong Province Universities and Colleges (Grants No. 20191001). Y. Zeng and D. X. Yao are supported by the National Natural Science Foundation of China (Grants No. 11974432) and the National Key R&D Program of China (Grant Nos. 2018YFA0306001 and 2017YFA0206203). D. Yan acknowledges the financial support by the National Key Laboratory Development Fund (No. 20190030). Y. H. Wang would like to acknowledge partial support by the National Key R&D Program of China (Grant No. 2017YFA0303000), National Natural Science Foundation of China (Grant No. 11827805), and Shanghai Municipal Science and Technology Major Project, China (Grant No. 2019SHZDZX01). M. Wang was supported by the National Natural Science Foundation of China (Grant Nos. 11904414 and 12174454) and the National Key R&D Program of China (Grant No. 2019YFA0705702).

Superconductivity in CuIr2-xAlxTe4 telluride chalcogenides

Dong Yan(严冬)1,5,†, Lingyong Zeng(曾令勇)1,†, Yijie Zeng(曾宜杰)2,6, Yishi Lin(林一石)3,4, Junjie Yin(殷俊杰)2, Meng Wang(王猛)2, Yihua Wang(王熠华)3,4, Daoxin Yao(姚道新)2, and Huixia Luo(罗惠霞)1,‡   

  1. 1 School of Materials Science and Engineering, State Key Laboratory of Optoelectronic Materials and Technologies, Key aboratory of Polymer Composite&Functional Materials, Guangzhou Key Laboratory of Flexible Electronic Materials and Wearable Devices, Sun Yat-Sen University, Guangzhou 510275, China;
    2 Center for Neuron Science and Technology, School of Physics, Sun Yat-Sen University, Guangzhou 510275, China;
    3 State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China;
    4 Shanghai Research Center for Quantum Sciences, Shanghai 201315, China;
    5 Key Laboratory of Functional Molecular Solids, Ministry of Education, College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241002, China;
    6 College of Science, Hangzhou Dianzi University, Hangzhou 310018, China
  • Received:2021-11-16 Revised:2021-12-10 Accepted:2021-12-16 Online:2022-02-22 Published:2022-02-24
  • Contact: Huixia Luo E-mail:luohx7@mail.sysu.edu.cn
  • Supported by:
    H. X. Luo acknowledges the financial support by the National Natural Science Foundation of China (Grant No. 11922415), Guangdong Basic and Applied Basic Research Foundation, China (Grants No. 2019A1515011718), and the Pearl River Scholarship Program of Guangdong Province Universities and Colleges (Grants No. 20191001). Y. Zeng and D. X. Yao are supported by the National Natural Science Foundation of China (Grants No. 11974432) and the National Key R&D Program of China (Grant Nos. 2018YFA0306001 and 2017YFA0206203). D. Yan acknowledges the financial support by the National Key Laboratory Development Fund (No. 20190030). Y. H. Wang would like to acknowledge partial support by the National Key R&D Program of China (Grant No. 2017YFA0303000), National Natural Science Foundation of China (Grant No. 11827805), and Shanghai Municipal Science and Technology Major Project, China (Grant No. 2019SHZDZX01). M. Wang was supported by the National Natural Science Foundation of China (Grant Nos. 11904414 and 12174454) and the National Key R&D Program of China (Grant No. 2019YFA0705702).

摘要: The relationship between charge-density-wave (CDW) and superconductivity (SC), two vital physical phases in condensed matter physics, has always been the focus of scientists' research over the past decades. Motivated by this research hotspot, we systematically studied the physical properties of the layered telluride chalcogenide superconductors CuIr$_{2-x}$Al$_{x}$Te$_{4}$ ($0 \leqslant x \leqslant 0.2$). Through the resistance and magnetization measurements, we found that the CDW order was destroyed by a small amount of Al doping. Meanwhile, the superconducting transition temperature ($T_{\rm c}$) kept changing with the change of doping amount and rose towards the maximum value of 2.75 K when $x=0.075$. The value of normalized specific heat jump ($\Delta C/\gamma T_{\rm c}$) for the highest $T_{\rm c}$ sample CuIr$_{1.925}$Al$_{0.075}$Te$_{4}$ was 1.53, which was larger than the BCS value of 1.43 and showed the bulk superconducting nature. In order to clearly show the relationship between SC and CDW states, we propose a phase diagram of $T_{\rm c}$ vs. doping content.

关键词: layered telluride chalcogenide, superconductivity, charge-density-wave, CuIr2-xAlxTe4

Abstract: The relationship between charge-density-wave (CDW) and superconductivity (SC), two vital physical phases in condensed matter physics, has always been the focus of scientists' research over the past decades. Motivated by this research hotspot, we systematically studied the physical properties of the layered telluride chalcogenide superconductors CuIr$_{2-x}$Al$_{x}$Te$_{4}$ ($0 \leqslant x \leqslant 0.2$). Through the resistance and magnetization measurements, we found that the CDW order was destroyed by a small amount of Al doping. Meanwhile, the superconducting transition temperature ($T_{\rm c}$) kept changing with the change of doping amount and rose towards the maximum value of 2.75 K when $x=0.075$. The value of normalized specific heat jump ($\Delta C/\gamma T_{\rm c}$) for the highest $T_{\rm c}$ sample CuIr$_{1.925}$Al$_{0.075}$Te$_{4}$ was 1.53, which was larger than the BCS value of 1.43 and showed the bulk superconducting nature. In order to clearly show the relationship between SC and CDW states, we propose a phase diagram of $T_{\rm c}$ vs. doping content.

Key words: layered telluride chalcogenide, superconductivity, charge-density-wave, CuIr2-xAlxTe4

中图分类号:  (Pnictides and chalcogenides)

  • 74.70.Xa
74.25.-q (Properties of superconductors) 74.25.Dw (Superconductivity phase diagrams) 71.45.Lr (Charge-density-wave systems)