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 ≤x≤ 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_(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(△C/γT_(c)) for the highest T_(c) sample CuIr_(2-x)Al_(x)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_(c) vs. doping content.
作者
Dong Yan
Lingyong Zeng
Yijie Zeng
Yishi Lin
Junjie Yin
Meng Wang
Yihua Wang
Daoxin Yao
Huixia Luo
严冬;曾令勇;曾宜杰;林一石;殷俊杰;王猛;王熠华;姚道新;罗惠霞(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 Universiy,Guangzhou 510275,China;Center for Neuron Science and Technology,School of Physics,Sun Ya-Sen University,Guangzhou 510275,China;State Key Laboratory of Surface Physics and Department of Physics,Fudan University,Shanghai 200433,China;Shanghai Research Center for Quantum Sciences,Shanghai 201315,China;Key Laboratory of Functional Molecular Solids,Ministry of Education,College of Chenistry and Materials Science,Anhui Normal University,Wuhu 241002,China;College of Science,Hangzhou Dianzi University,Hangzhou 310018,China)
基金
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)
the Pearl River Scholarship Program of Guangdong Province Universities and Colleges (Grants No. 20191001)
supported by the National Natural Science Foundation of China (Grants No. 11974432)
the National Key R&D Program of China (Grant Nos. 2018YFA0306001 and 2017YFA0206203)
the financial support by the National Key Laboratory Development Fund (No. 20190030)
partial support by the National Key R&D Program of China (Grant No. 2017YFA0303000)
National Natural Science Foundation of China (Grant No. 11827805)
Shanghai Municipal Science and Technology Major Project, China (Grant No. 2019SHZDZX01)
supported by the National Natural Science Foundation of China (Grant Nos. 11904414 and 12174454)
the National Key R&D Program of China (Grant No. 2019YFA0705702)。
