Extended Data Fig. 1: Magnetism and electrical transport of LaSiI.
From: Two-dimensional heavy fermions in the van der Waals metal CeSiI
a, Temperature dependence of the magnetic susceptibility measured with an applied magnetic field of 1 T. The magnetic susceptibility of LaSiI is essentially temperature independent over the whole temperature range with no magnetic transition, and ca. one order of magnitude smaller than that of CeSiI. This is consistent with a non-magnetic system with a small amount of a ferromagnetic impurity, presumably iron or iron oxide. Inset: the field dependence of the magnetization at T = 2 K, showing a clear ferromagnetic response, verifies the presence of a ferromagnetic impurity. Assuming the impurity is Fe, we can estimate the amount in the sample to be ~1.83 µg (~0.01 wt%). b, Temperature dependence of the resistivity of LaSiI at zero magnetic field. c, Magnetoresistance of LaSiI at T = 2 and 30 K.
