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arXiv · 1708.08877

Large magnetoresistance in type-II Weyl semimetal WP$_2$

Aifeng Wang·D. Graf·Yu Liu·Qianheng Du·Jiabao Zheng·Hechang Lei·C. Petrovic
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Abstract

We report magnetotransport study on type-II Weyl semimetal WP$_2$ single crystals. Magnetoresistance (MR) exhibits a nonsaturating $H^{n}$ field dependence (14,300\% at 2 K and 9 T) whereas systematic violation of Kohler's rule was observed. Quantum oscillations reveal a complex multiband electronic structure. The cyclotron effective mass close to the mass of free electron m$_e$ was observed in quantum oscillations along $b$-axis, while reduced effective mass of about 0.5$m_e$ was observed in $a$-axis quantum oscillations, suggesting Fermi surface anisotropy. Temperature dependence of the resistivity shows a large upturn that cannot be explained by the multi-band magnetoresistance of conventional metals. Even though crystal structure of WP$_{2}$ is not layered as in transition metal dichalcogenides, quantum oscillations suggest partial two-dimensional character.

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Aifeng Wang, D. Graf, Yu Liu, Qianheng Du, Jiabao Zheng, Hechang Lei, C. Petrovic. 2017-08-29. Large magnetoresistance in type-II Weyl semimetal WP$_2$. https://doi.org/10.1103/physrevb.96.121107

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