Extended Kohler${}^{,}$s Rule of Magnetoresistance

Abstract

A notable phenomenon in topological semimetals is the violation of Kohler${}^{,}$s rule, which dictates that the magnetoresistance $MR$ obeys a scaling behavior of $MR=f(H/{\rho }_0$), where $MR=[{\rho }_H-{\rho }_0]/{\rho }_0$ and $H$ is the magnetic field, with ${\rho }_H$ and ${\rho }_0$ being the resistivity at $H$ and zero field, respectively. Here we report a violation originating from thermally-induced change in the carrier density. We find that the magnetoresistance of the Weyl semimetal, TaP, follows an extended Kohler${}^{,}$s rule $MR=f[H/(n_T{\rho }_0)]$, with $n_T$ describing the temperature dependence of the carrier density. We show that $n_T$ is associated with the Fermi level and the dispersion relation of the semimetal, providing a new way to reveal information on the electronic bandstructure. We offer a fundamental understanding of the violation and validity of Kohler${}^{,}$s rule in terms of different temperature-responses of $n_T$. We apply our extended Kohler${}^{,}$s rule to BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$ to settle a long-standing debate on the scaling behavior of the normal-state magnetoresistance of a superconductor, namely, $MR$ ~ $ta{n}^2{\theta }_H$, where ${\theta }_H$ is the Hall angle. We further validate the extended Kohler${}^{,}$s rule and demonstrate its generality in a semiconductor, InSb, where the temperature-dependent carrier density can be reliably determined both theoretically and experimentally.

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• Nonlinear field dependence of Hall effect and high-mobility multi-carrier transport in an altermagnet CrSb
• Weak Antilocalization and topological edge states in PdSn${}_4$
• Unreliability of two-band model analysis of magnetoresistivities in unveiling temperature-driven Lifshitz transition
• Magnetotransport Properties and Fermi Surface Topology of Nodal line Semimetal InBi
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