Large Magnetoresistance in Compensated Semimetals TaAs${}_2$ and NbAs${}_2$

Abstract

We report large magnetoresistance (MR) at low temperatures in single-crystalline nonmagnetic compounds TaAs${}_2$ and NbAs${}_2$. Both compounds exhibit parabolic-field-dependent MR larger than $5\times 10^3$ in a magnetic field of 9 Tesla at 2 K. The MR starts to deviate from parabolic dependence above 10 T and intends to be saturated in 45 T for TaAs${}_2$ at 4.2 K. The Hall resistance measurements and band structural calculations reveal their compensated semimetal characteristics. The large MR at low temperatures is ascribed to a resonance effect of the balanced electrons and holes with large mobilities. We also discuss the relation of the MR and samples' quality for TaAs${}_2$ and other semimetals. We found that the magnitudes of MR are strongly dependent on the samples' quality for different compounds.

26 pages, 11 figures, 2 tables

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