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Large magnetoresistance in type-II Weyl semimetal WP₂

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arxiv 1708.08877 v1 pith:LBLY3GFA submitted 2017-08-29 cond-mat.mtrl-sci cond-mat.mes-hall

Large magnetoresistance in type-II Weyl semimetal WP₂

classification cond-mat.mtrl-sci cond-mat.mes-hall
keywords oscillationsquantummagnetoresistancemassobservedaxisdependenceeffective
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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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