Abstract
The 121Sb Knight shift and the 121,123Sb nuclear spin-lattice relaxation time T1 in U3Ni3Sb4 have been measured. In the temperature range between 25 and 250 K, 1⁄T1, which has been measured by nuclear quadrupole resonance (NQR), follows an activation law with an activation energy of 21.1 meV. The relaxation process is dominated by the magnetic contribution. The Knight shift is represented as the sum of a strongly temperature-dependent anisotropic term and a temperature-independent term. The transferred hyperfine field from the U 5f electrons through the U 5f-Sb 5p hybridization makes an important contribution to the Knight shift.
