Huge linear magnetoresistance due to open orbits in $\gamma$-PtBi${}_2$

Abstract

Some single-crystalline materials present an electrical resistivity which decreases between room temperature and low temperatures at zero magnetic field as in a good metal and switches to a nearly semiconductinglike behavior at low temperatures with the application of a magnetic field. Often, this is accompanied by a huge and nonsaturating linear magnetoresistance which remains difficult to explain. Here we present a systematic study of the magnetoresistance in single-crystal $\gamma$-PtBi${}_2$. We observe that the angle between the magnetic field and the crystalline $c$ axis fundamentally changes the magnetoresistance, going from a saturating to a nonsaturating magnetic field dependence. In between, there is one specific angle where the magnetoresistance is perfectly linear with the magnetic field. We show that the linear dependence of the nonsaturating magnetoresistance is due to the formation of open orbits in the Fermi surface of $\gamma$-PtBi${}_2$.

12 pages, 8 figures including Supplementary Material

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• Enhanced weak superconductivity in trigonal $\gamma$-PtBi${}_2$
• Superconducting density of states of PtPb4
• Investigation on high-order planar Hall effect in trigonal PtBi${}_2$
• Experimental detection of topological electronic state and large linear magnetoresistance in $SrS{n}_4$ superconductor
• Electronic structure in a transition metal dipnictide TaAs2
• Observation of two-level critical-state in a van-der-Waals superconductor Pt(Bi${}_{1-x}$Se${}_x$)${}_2$
• Conventional superconductivity in single-crystalline BiPt