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

页数：9

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