NMR study for4f-localized ferromagnet CeRu2Ga2B

Abstract

Nuclear magnetic resonance (NMR) studies using ${}^{11}$B and ${}^{69,71}$Ga have been performed on the tetragonal Ce-based ferromagnet CeRu${}_{2}$Ga${}_{2}$B. The Knight shifts for the nuclei show an Ising-type anisotropy along the $c$ axis, similar to results from the static susceptibility. From the Knight shift measurements, the hyperfine coupling constants have been determined. The anisotropy of the spin-lattice relaxation rates $1/{T}_{1}$ indicates that the anisotropy of spin fluctuations are also Ising-like along the $c$ axis. The localized character of the $4f$ electrons in this system is discussed.