Non-Stoichiometry Effects on the Extreme Magnetoresistance in Weyl Semimetal WTe$_{2}$

doi:10.1088/0256-307X/35/9/097101

Chin. Phys. Lett.

2018, Vol. 35

Issue (9): 097101 DOI: 10.1088/0256-307X/35/9/097101

CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES

Non-Stoichiometry Effects on the Extreme Magnetoresistance in Weyl Semimetal WTe$_{2}$

Ji-Xiang Gong^1,2, Jun Yang¹, Min Ge^2**, Yong-Jian Wang¹, Dan-Dan Liang¹, Lei Luo¹, Xiu Yan¹, Wei-Li Zhen¹, Shi-Rui Weng¹, Li Pi^1,2, Chang-Jin Zhang^1,3**, Wen-Ka Zhu^1**

¹High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei 230031
²Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei 230026
³Institute of Physical Science and Information Technology, Anhui University, Hefei 230601

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Ji-Xiang Gong, Jun Yang, Min Ge et al 2018 Chin. Phys. Lett. 35 097101

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Abstract Non-stoichiometry effect on the extreme magnetoresistance is systematically investigated for the Weyl semimetal WTe$_{2}$. Magnetoresistance and Hall resistivity are measured for the as-grown samples with a slight difference in Te vacancies and the annealed samples with increased Te vacancies. The fits to a two-band model show that the magnetoresistance is strongly dependent on the residual resistivity ratio (i.e., the degree of non-stoichiometry), which is eventually understood in terms of electron doping that not only breaks the balance between electron-type and hole-type carrier densities, but also reduces the average carrier mobility. Thus the compensation effect and ultrahigh mobility are probably the main driving force of the extreme magnetoresistance in WTe$_{2}$.

Received: 25 May 2018 Published: 29 August 2018

PACS:	71.55.Ak	(Metals, semimetals, and alloys)
	73.43.Qt	(Magnetoresistance)
	72.20.Fr	(Low-field transport and mobility; piezoresistance)
	74.62.Dh	(Effects of crystal defects, doping and substitution)

Fund: Supported by the National Key R&D Program of China under Grant Nos 2016YFA0300404 and 2017YFA0403600, the National Natural Science Foundation of China under Grant Nos 51603207, U1532267, 11574288 and 11674327, and the Natural Science Foundation of Anhui Province under Grant No 1708085MA08.

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https://cpl.iphy.ac.cn/10.1088/0256-307X/35/9/097101 OR https://cpl.iphy.ac.cn/Y2018/V35/I9/097101

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	Ji-Xiang Gong
	Jun Yang
	Min Ge
	Yong-Jian Wang
	Dan-Dan Liang
	Lei Luo
	Xiu Yan
	Wei-Li Zhen
	Shi-Rui Weng
	Li Pi
	Chang-Jin Zhang
	Wen-Ka Zhu

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