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)Ix for 0.0 ≤x≤ 1.0....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)Ix for 0.0 ≤x≤ 1.0.Xray diffraction results indicate that both of a and c lattice parameters increase linearly when 0.0 ≤ x ≤ 1.0.The resistivity measurements indicate that the CDW is destabilized with slight x but reappears at x≥0.9 with very high TCDW.Meanwhile,the superconducting transition temperature Tc 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(ΔC/γTc) 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 |Cp(T,H)],magnetization M(T,H) and magneto-transport ρ(T,H) measurements further suggest that CuIr_(2)Te_(4-x)Ix bulks are type-Ⅱ superconductors.Finally,an electronic phase diagram for this CuIr_(2)Te_(4-x)Ix system has been constructed.The present study provides a suitable material platform for further investigation of the interplay of the CDW and superconductivity.展开更多
过渡金属硫族化合物(Transition metal chalcogenides,TMCs)因具有丰富的晶体结构和不寻常的电子特性呈现出有趣的物理现象,引起了人们的持续关注。重点介绍了过渡金属二硫化物(Transition metal dichalcogenides,TMDCs)中电荷密度波(Ch...过渡金属硫族化合物(Transition metal chalcogenides,TMCs)因具有丰富的晶体结构和不寻常的电子特性呈现出有趣的物理现象,引起了人们的持续关注。重点介绍了过渡金属二硫化物(Transition metal dichalcogenides,TMDCs)中电荷密度波(Charge density wave,CDW)和超导电性(Superconductivity,SC)的最新重要发现,系统分析和比较了TMDCs的晶体和能带结构,总结了掺杂和高压对TMDCs中CDW和SC的调控规律,探讨了TMDCs中CDW和SC之间的关系,展望了未来研究方向和机遇。展开更多
基金Supported by the National Natural Science Foundation of China(Grants No.11922415)the Guangdong Basic and Applied Basic Research Foundation(Grants No.2019A1515011718)+10 种基金the Fundamental Research Funds for the Central Universities(Grants No.19lgzd03)the Key R&D Program of Guangdong Province,China(Grants No.2019B110209003)the Pearl River Scholarship Program of Guangdong Province Universities and Colleges(Grants No.20191001)supported by the National Natural Science Foundation of China(Grant No.12004441)the Hundreds of Talents Program of Sun Yat-Sen Universitythe Fundamental Research Funds for the Central Universities(Grants No.20lgpy165)supported by the National Natural Science Foundation of China(Grant No.11974432)NKRDPC-2017YFA0206203,and NKRDPC-2018YFA0306001supported by the National Nature Science Foundation of China(11904414)the Natural Science Foundation of Guangdong(2018A030313055)National Key Research and Development Program of China(Grants No.2019YFA0705700)。
文摘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)Ix for 0.0 ≤x≤ 1.0.Xray diffraction results indicate that both of a and c lattice parameters increase linearly when 0.0 ≤ x ≤ 1.0.The resistivity measurements indicate that the CDW is destabilized with slight x but reappears at x≥0.9 with very high TCDW.Meanwhile,the superconducting transition temperature Tc 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(ΔC/γTc) 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 |Cp(T,H)],magnetization M(T,H) and magneto-transport ρ(T,H) measurements further suggest that CuIr_(2)Te_(4-x)Ix bulks are type-Ⅱ superconductors.Finally,an electronic phase diagram for this CuIr_(2)Te_(4-x)Ix system has been constructed.The present study provides a suitable material platform for further investigation of the interplay of the CDW and superconductivity.
文摘过渡金属硫族化合物(Transition metal chalcogenides,TMCs)因具有丰富的晶体结构和不寻常的电子特性呈现出有趣的物理现象,引起了人们的持续关注。重点介绍了过渡金属二硫化物(Transition metal dichalcogenides,TMDCs)中电荷密度波(Charge density wave,CDW)和超导电性(Superconductivity,SC)的最新重要发现,系统分析和比较了TMDCs的晶体和能带结构,总结了掺杂和高压对TMDCs中CDW和SC的调控规律,探讨了TMDCs中CDW和SC之间的关系,展望了未来研究方向和机遇。
