Magnetic fluctuations in the itinerant ferromagnet LaCrGe3 studied by 139La NMR*

Recently much attention has been paid to itinerant ferromagnetic (FM) compounds because of the observations of unconventional superconductivity (SC) as well as the avoidance of FM quantum critical point (QCP) under application of pressure (p) and magnetic field (H). In this context, the itinerant ferromagnet LaCrGe3 (Curie temperature of T_C=85 K) is very unique. It exhibits an avoided FM QCP under pressure through both a modulated antiferromagnetic phase as well as tricritical wing structure in its temperature-pressure-magnetic field (T−p−H) phase diagram. In order to characterize the static and dynamical magnetic properties of this peculiar material, we carried out ¹³⁹La nuclear magnetic resonance (NMR) measurements. Here we present our analysis of the NMR data using self-consistent-renormalization theory and provide a comparison of this system in the generalized Rhodes-Wohlfarth plot with other similar itinerant ferromagnets.