Complex transport and magnetism in inhomogeneous mixed valence Ce$_3$Ir$_4$Ge$_{13}$

摘要: We report the discovery of , a Remeika phase with a complex array of structural, electronic, and magnetic properties. Our single crystal x-ray diffraction measurements show that forms in the tetragonally distorted space group, which has three distinct rare earth sites. The electrical resistivity is almost temperature independent over three decades in temperature, from 0.4 K to 400 K, while the Hall coefficient measurements are consistent with a low-carrier semimetal. Magnetic susceptibility measurements reveal an effective moment, , that falls significantly short of the expected value for , suggesting that two of the rare earth sites are occupied by magnetic while the third is occupied by nonmagnetic . Upon cooling, first enters a short range magnetically ordered state below , marked by a deviation from Curie-Weiss behavior in susceptibility and a broad field …