Magnetic fluctuations in the itinerant ferromagnet LaCrGe3 studied by 139La NMR
Abstract
LaCrGe3 is an itinerant ferromagnet with a Curie temperature of T c = 85 K and exhibits an avoided ferromagnetic quantum critical point under pressure through a modulated antiferromagnetic phase as well as tri-critical wing structure in its temperature-pressure-magnetic field (T-p-H) phase diagram. In order to understand the static and dynamical magnetic properties of LaCrGe3, we carried out 139La nuclear magnetic resonance (NMR) measurements. Based on the analysis of NMR data, using the self-consistent-renomalization (SCR) theory, the spin fluctuations in the paramagnetic state are revealed to be isotropic ferromagnetic and three dimensional (3D) in nature. Moreover, the system is found to follow the generalized Rhodes-Wohfarth relation which is expected in 3D itinerant ferromagnetic systems. As compared to other similar itinerant ferromagnets, the Cr 3d electrons and their spin fluctuations are characterized to have a relatively high degree of localization in real space.
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