Linear nonsaturating magnetoresistance in the Nowotny chimney ladder compound Ru${}_2$Sn${}_3$

Abstract

We present magnetoresistivity measurements in high-quality single crystals of the Nowotny chimney ladder compound Ru${}_2$Sn${}_3$. We find a linear and nonsaturating magnetoresistance up to 20 T. The magnetoresistance changes with the magnetic field orientation at small magnetic fields, from a positive to a negative curvature. Above 5 T, the magnetoresistance shows no sign of saturation up to 20 T for any measured angle. The shape of the anisotropy in the magnetoresistance remains when increasing temperature and Kohler's rule is obeyed. We associate the linear and nonsaturating magnetoresistance to a small Fermi surface with hot spots, possibly formed as a consequence of the structural transition. We discuss the relevance of electron-electron interactions under magnetic fields and aspects of the topologically nontrivial properties expected in Ru${}_2$Sn${}_3$.

6 pages, 5 figures

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