In-115 NQR study in CeIn3

We have carried out In-115 nuclear quadrupole resonance (NQR) measurement o f the antiferromagnetic (AF) dense-Kondo compound CeIn3 (T-N = 10 K). The e valuated electric quadrupole interaction parameters of In-115 from NQR spec trum are v(Q) = 9.6 MHz and n = 0. In the ordered state, a small internal h eld which is perpendicular to the principal axis of the electric held gradi ent, 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 h as 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 decrea ses rapidly and varies in proportion to T at very low temperatures. (C) 199 9 Elsevier Science B.V. All rights reserved.