Composition and temperature-dependent phase transition in miscible Mo1-xWxTe2 single crystals

被引：70
作者：
Lv, Yang-Yang [1 ,2 ]
Cao, Lin [1 ,2 ]
Li, Xiao [1 ,3 ]
Zhang, Bin-Bin [1 ,2 ]
Wang, Kang [1 ,3 ]
Pang, Bin [1 ,2 ]
Ma, Ligang [1 ,3 ]
Lin, Dajun [1 ,2 ]
Yao, Shu-Hua [1 ,2 ]
Zhou, Jian [1 ,2 ]
Chen, Y. B. [1 ,3 ]
Dong, Song-Tao [4 ]
Liu, Wenchao [1 ,2 ,5 ,6 ]
Lu, Ming-Hui [1 ,2 ]
Chen, Yulin [7 ,8 ,9 ]
Chen, Yan-Feng [1 ,2 ,10 ]
机构：
[1] Nanjing Univ, Natl Lab Solid State Microstruct, Nanjing 210093, Jiangsu, Peoples R China
[2] Nanjing Univ, Dept Mat Sci & Engn, Nanjing 210093, Jiangsu, Peoples R China
[3] Nanjing Univ, Dept Phys, Nanjing 210093, Jiangsu, Peoples R China
[4] Jiangsu Univ Sci & Technol, Inst Mat Sci & Engn, Zhenjiang 212003, Peoples R China
[5] Nanjing Tech Univ, IAM, Nanjing 211800, Jiangsu, Peoples R China
[6] Nanjing Tech Univ, Jiangsu Natl Synerget Innovat Ctr Adv Mat SICAM, Nanjing 211800, Jiangsu, Peoples R China
[7] Shanghai Tech Univ, Sch Phys Sci & Technol, Shanghai 200031, Peoples R China
[8] Tsinghua Univ, State Key Lab Low Dimens Quantum Phys, Collaborat Innovat Ctr Quantum Matter, Beijing 100084, Peoples R China
[9] Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China
[10] Nanjing Univ, Collaborat Innovat Ctr Adv Microstruct, Nanjing 210093, Jiangsu, Peoples R China
来源：
SCIENTIFIC REPORTS | 2017年 / 7卷
基金：
中国国家自然科学基金;
关键词：
WEYL FERMION SEMIMETAL; MAGNETORESISTANCE; STATE; SUPERCONDUCTIVITY; RESISTIVITY; DISCOVERY; MOTE2;
D O I：
10.1038/srep44587
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
Transition metal dichalcogenides (TMDs) WTe2 and MoTe2 with orthorhombic Td phase, being potential candidates as type-II Weyl semimetals, are attracted much attention recently. Here we synthesized a series of miscible Mo1-xWxTe2 single crystals by bromine vapor transport method. Composition-dependent X-ray diffraction and Raman spectroscopy, as well as composition and temperature-dependent resistivity prove that the tunable crystal structure (from hexagonal (2H), monoclinic (beta) to orthorhombic (Td) phase) can be realized by increasing W content in Mo1-xWxTe2. Simultaneously the electrical property gradually evolves from semiconductor to semimetal behavior. Temperature-dependent Raman spectroscopy proves that temperature also can induce the structural phase transition from beta to Td phase in Mo1-xWxTe2 crystals. Based on aforementioned characterizations, we map out the temperature and composition dependent phase diagram of Mo1-xWxTe2 system. In addition, a series of electrical parameters, such as carrier type, carrier concentration and mobility, have also been presented. This work offers a scheme to accurately control structural phase in Mo1-xWxTe2 system, which can be used to explore type-II Weyl semimetal, as well as temperature/composition controlled topological phase transition therein.
引用
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页数：9
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