NMR study for $4f$-localized ferromagnet CeRu${}_{2}$Ga${}_{2}$B

NMR study for $4 f$ -localized ferromagnet CeRu $_{2}$ Ga $_{2}$ B

H. Sakai, Y. Tokunaga, S. Kambe, R. E. Baumbach, F. Ronning, E. D. Bauer, and J. D. Thompson

Phys. Rev. B 86, 094402 – Published 4 September 2012

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 $4 f$ electrons in this system is discussed.