Extremely Large Magnetoresistance And Shubnikov-De Haas Oscillations In The Compensated Semimetal W2as3

We report the extremely large magnetoresistance (XMR) property and Shubnikov-de Haas (SdH) oscillations in a quasi-one-dimensional material W2As3 single crystal, which shows good metallic behavior with a typical residual resistivity ratio rho(300 K)/rho(1.8 K) = 1240. In a magnetic field, the resistivity shows a quick upturn behavior and saturates with a plateau as the temperature cools down. At T = 1.8 K, the magnetoresistance of W(2)As(3 )increases quadratically with the magnitude of the magnetic field and reaches up to 32000% (B = 9 T) without any trend of saturation, which suggests the semiclassical nature during the transport process. The result of Hall resistivity measurements further points out that the XMR property in W2As3 originates from the compensation of electrons and holes with high mobility (mu(e) = 4.9 x 10(4) cm(2) V-1 s(-1) at 1.8 K). Furthermore, SdH oscillations can be distinguished clearly from both magnetoresistivity and Hall resistivity. The quantum mobility calculated from the SdH oscillations is about 1-2 orders lower than that calculated from the transport mobility, which suggests that the small angle scattering is dominant in W2As3. The angle dependence of SdH oscillations implies the complex Fermi surface structure with obvious anisotropy in W2As3.