化学气相传输法制备的层状1 T- TaS2-xSex单晶中的新超导电性
New Superconductivity in Layered 1T-TaS2-xSex Single Crystals Fabricated by Chemical Vapor Transport
摘要：
用化学气相输运法成功地制备了过渡金属双硫属化合物1 T-TaS_（2-x）Sex（0<=x<=2）单晶。这是第一个通过取代S位置的超导例子，这违反了基于以下事实的初始规则：通过施加高压或取代Ta位置，超导性仅在1 T-TaS 2中出现。我们证明了一系列的电子态在1 T-TaS 2-xSex与硒含量的外观。也就是说，莫特相熔化成一个近相称的电荷密度波（NCCDW）相，超导性在很宽的x范围内发展的NCCDW状态，并最终相称的电荷密度波（CCDW）相重硒含量再现。结果表明，超导性仅表现为稳定的Ta 5d带，说明超导性和NCCDW相共存于实空间中是1 T-TaS 2体系的普遍性质.
英文摘要：
Layered transition-metal dichalcogenides 1T-TaS2-xSex (0<=x<=2) single crystals have been successfully fabricated by using a chemical vapor transport technique in which Ta locates in octahedral coordination with S and Se atoms. This is the first superconducting example by the substitution of S site, which violates an initial rule based on the fact that superconductivity merely emerges in 1T-TaS2 by applying the high pressure or substitution of Ta site. We demonstrate the appearance of a series of electronic states in 1T-TaS2-xSex with Se content. Namely, the Mott phase melts into a nearly commensurate charge-density-wave (NCCDW) phase, superconductivity in a wide x range develops within the NCCDW state, and finally commensurate charge-density-wave (CCDW) phase reproduces for heavy Se content. The present results reveal that superconductivity is only characterized by robust Ta 5d band, demonstrating the universal nature in 1T-TaS2 systems that superconductivity and NCCDW phase coexist in the real space.
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