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

Abstract

LaCrGe${}_3$ is an itinerant ferromagnet with a Curie temperature of $T_{\mathrm{c}}$ = 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 LaCrGe${}_3$, we carried out ${}^{139}$La 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 3$d$ electrons and their spin fluctuations are characterized to have a relatively high degree of localization in real space.

7 pages, 6 figures, accepted for publication in Phys. Rev. B

References in corpus (5)

• Pressure induced superconductivity on the border of magnetic order in MnP
• Tricritical point and wing structure in the itinerant ferromagnet UGe2
• Disorder dependence of the ferromagnetic quantum phase transition
• Avoided ferromagnetic quantum critical point in CeRuPO
• Magnetic hard-axis ordering near ferromagnetic quantum criticality

Cited by in corpus (1)

• Magnetic properties of the itinerant ferromagnet LaCrGe3 under pressure studied by 139La NMR