Correlation of Crystal Quality and Extreme Magnetoresistance of WTe${}_2$

Abstract

High quality single crystals of WTe${}_2$ were grown using a Te flux followed by a cleaning step involving self-vapor transport. The method is reproducible and yields consistently higher quality single crystals than are typically obtained via halide assisted vapor transport methods. Magnetoresistance (MR)values at 9 Tesla and 2 Kelvin as high as 1.75 million \%, nearly an order of magnitude higher than previously reported for this material, were obtained on crystals with residual resistivity ratio (RRR) of approximately 1250. The MR follows a near B${}^2$ law (B = 1.95(1)) and, assuming a semiclassical model, the average carrier mobility for the highest quality crystal was found to be ~167,000 cm${}^2$/Vs at 2 K. A correlation of RRR, MR ratio and average carrier mobility (${\mu }_{avg}$) is found with the cooling rate during the flux growth.

7 pages, 3 figures, 1 table

References in corpus (3)

• Quantum oscillations, thermoelectric coefficients and the Fermi surface of semi-metallic WTe2
• Anisotropic Magnetotransport and Exotic Longitudinal Linear Magnetoresistance in WTe2 Crystals
• Electron scattering in tantalum monoarsenide

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• Direct evidence for charge compensation induced large magnetoresistance in thin WTe2
• Thermopower and Unconventional Nernst in the Predicted Type-II Weyl Semi-metal WTe${}_2$
• Thickness Dependence of Magneto-transport Properties in Tungsten Ditelluride
• Tuning the electronic band structure in a kagome ferromagnetic metal via magnetization
• Optical conductivity of the type-II Weyl semimetal WTe${}_2$ under pressure
• Fermi surface origin of the low-temperature magnetoresistance anomaly