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

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.

Accepted by PRB

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• Strong and Tunable Electrical-Anisotropy in Type-II Weyl Semimetal Candidate WP2 with Broken Inversion Symmetry
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• Large nonsaturating magnetoresistance, weak anti-localization and non-trivial topological states in SrAl${}_2$Si${}_2$
• Pressure effect on the topologically nontrivial electronic state and transport of lutecium monobismuthide
• Large Magnetoresistance and Nontrivial Berry Phase in Nb3Sb Crystals with A15 Structure
• Temperature-dependent Fermi surface probed by Shubnikov-de Haas oscillations in topological semimetal candidates DyBi and HoBi
• Strong nonlinear optical response and transient symmetry switching in Type-II Weyl semimetal $\beta$-WP2
• SrPd, a candidate material with extremely large magnetoresistance
• Possible origin of extremely large magnetoresistance in the topological insulator CaBi2 single crystal
• Magnetoresistance and Scaling Laws in Type-II Weyl Semimetal WP_2