Magnetoresistance and robust resistivity plateau in MoAs2

Abstract

We have grown the MoAs${}_2$ single crystal which crystallizes in a monoclinic structure with C2/m space group. Transport measurements show that MoAs${}_2$ displays a metallic behavior at zero field and undergoes a metal-to-semiconductor crossover at low temperatures when the applied magnetic field is over 5 T. A robust resistivity plateau appears below 18 K and persists for the field up to 9 T. A large positive magnetoresistance (MR), reaching about 2600\% at 2 K and 9 T, is observed when the field is perpendicular to the current.The MR becomes negative below 40 K when the field is rotated to be parallel to the current. The Hall resistivity shows the non-linear field-dependence below 70 K. The analysis using two-band model indicates a compensated electron-hole carrier density at low temperatures. A combination of the breakdown of Kohler's rule, the abnormal drop and the cross point in Hall data implies that a possible Lifshitz transition has occurred between 30 K and 60 K, likely driving the compensated electron-hole density, the large MR as well as the metal-semiconductor transition in MoAs${}_2$. Our results indicate that the family of centrosymmetric transition-metal dipnictides has rich transport behavior which can in general exhibit variable metallic and topological features.

10 pages, 6 figures

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• Large nonsaturating magnetoresistance, weak anti-localization and non-trivial topological states in SrAl${}_2$Si${}_2$
• Quantum transport in a compensated semimetal W2As3 with nontrivial Z2 indices
• Electronic structure and open-orbit Fermi surface topology in isostructural semimetals NbAs${}_2$ and W${}_2$As${}_3$ with extremely large magnetoresistance
• Surface states induced weak anti-localization effect in Bi0.85Sb0.15 topological single crystal
• Electronic structure in a transition metal dipnictide TaAs2
• Intertwined topological phases in TaAs2 nanowires with giant magnetoresistance and quantum coherent surface transport
• Dirac state switching in transition metal diarsenides
• Materials and possible mechanisms of extremely large magnetoresistance: A review
• Magnetoresistance and Scaling Laws in Type-II Weyl Semimetal WP_2