高压物理学报2024，Vol.38Issue(2)：42-48,7.DOI:10.11858/gywlxb.20230841
CuTe2单晶的高温高压合成和物性表征
High-Temperature and High-Pressure Synthesis and Characterization of CuTe2 Single Crystal
摘要
Abstract
The 3d transition metal dichalcogenide MX2(M=Mn,Fe,Co,Ni,Cu,Zn;X=S,Se,Te)with pyrite structure has attracted widespread attention due to their novel physical properties.Among them,the CuX2(X=S,Se,and Te)is the only known superconducting system,for which the superconducting transition temperatures(Tc)are 1.5 K(CuS2),2.4 K(CuSe2)and 1.3 K(CuTe2),respectively.Because they can only be synthesized under high-pressure and high-temperature(HPHT)conditions,earlier reports on CuTe2 are based on the polycrystalline samples and the detailed physical properties have not been reported on single crystal so far.Here,we synthesized high-quality CuTe2 single crystals under HPHT conditions at 5 GPa and 900℃ using the Kawai type 6/8 two-stage multianvil apparatus and performed detailed crystal,transport,magnetism,and specific heat measurements on its physical properties.The results showed that it belongs to the weakly coupled type-Ⅱsuperconductor with Tc about 1.3 K.We systematically compared the relevant superconducting parameters of CuS2,CuSe2,and CuTe2 and further revealed the relationship between their density of state near the Fermi surface and superconducting properties.关键词
高温高压合成/黄铁矿/CuTe2/超导Key words
high-temperature and high-pressure synthesis/pyrite/CuTe2/superconductivity分类
数理科学引用本文复制引用
石利粉,程金光,王宁宁,刘子儀,崔琦,张晓晓,刘庆元,隋郁,王铂森,孙建平..CuTe2单晶的高温高压合成和物性表征[J].高压物理学报,2024,38(2):42-48,7.基金项目
国家自然科学基金(12025408,12174424,11921004,11904391) （12025408,12174424,11921004,11904391）
国家重点研发计划(2021YFA1400200,2022YFA1403900) （2021YFA1400200,2022YFA1403900）
中国科学院青年创新促进会项目(2023007) （2023007）
