$H$-linear magnetoresistance in the $T^2$ resistivity regime of overdoped infinite-layer nickelate La${}_{1-x}$Sr${}_x$NiO${}_2$

Abstract

We report a systematic magnetotransport study on high-crystallinity La${}_{1-x}$Sr${}_x$NiO${}_2$ (LSNO) thin films with $x=0.20-0.24$. By conducting pulsed-field transport experiment up to 62 T, we reveal two salient features of the normal-state transport in overdoped LSNO thin films: (1) the magnetoresistance does not follow the Kohler's rule but exhibits a $H$-linear behavior in the high $H/T$ limit and (2) the normal-state $\rho (T)$ below 30 K consistently follows a $T^2$ behavior across the overdoped regime. Our results demonstrate a coexistence of $H$-linear magnetoresistance and $T^2$ resistivity in a model unconventional superconductor and provide new information on the transport characteristics of the normal ground state that host superconductivity in infinite-layer nickelates.

6 pages, 4 figures and 1 table