Temperature dependent three-dimensional anisotropy of the magnetoresistance in WTe${}_2$

Abstract

Extremely large magnetoresistance (XMR) was recently discovered in WTe${}_2$, triggering extensive research on this material regarding the XMR origin. Since WTe${}_2$ is a layered compound with metal layers sandwiched between adjacent insulating chalcogenide layers, this material has been considered to be electronically two-dimensional (2D). Here we report two new findings on WTe${}_2$: (1) WTe${}_2$ is electronically 3D with a mass anisotropy as low as $2$, as revealed by the 3D scaling behavior of the resistance $R(H,\theta )=R({\epsilon }_{\theta }H)$ with ${\epsilon }_{\theta }=({\cos }^2\theta +{\gamma }^{-2}{\sin }^2\theta {)}^{1/2}$, $\theta$ being the magnetic field angle with respect to c-axis of the crystal and $\gamma$ being the mass anisotropy; (2) the mass anisotropy $\gamma$ varies with temperature and follows the magnetoresistance behavior of the Fermi liquid state. Our results not only provide a general scaling approach for the anisotropic magnetoresistance but also are crucial for correctly understanding the electronic properties of WTe${}_2$, including the origin of the remarkable 'turn-on' behavior in the resistance versus temperature curve, which has been widely observed in many materials and assumed to be a metal-insulator transition.

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• Titanic Magnetoresistance in WTe2
• Electronic structure basis for the titanic magnetoresistance in WTe${}_2$
• Quantum oscillations, thermoelectric coefficients and the Fermi surface of semi-metallic WTe2
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