115In NQR study in CeIn3

We have carried out In-115 nuclear quadrupole resonance (NQR) measurement of the antiferromagnetic (AF) dense-Kondo compound CeIn3 (T-N = 10 K). The evaluated electric quadrupole interaction parameters of In-115 from NQR spectrum are v(Q) = 9.6 MHz and n = 0. In the ordered state, a small internal held which is perpendicular to the principal axis of the electric field gradient, appears (4-5 kOe at 4.2 K). The nuclear spin-lattice relaxation rate 1/T-1 is nearly temperature (T) independent in the paramagnetic state, and has no critical slowing down phenomenon at T-N. The critical fluctuations of Ce moments are strongly suppressed in this system. Below T-N, 1/T-1 decreases rapidly and varies in proportion to T at very low temperatures. (C) 1999 Elsevier Science B.V. All rights reserved.