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We report $^{121,123}$Sb NQR studies on single crystals of the narrow gapsemiconductor Ce3Au3Sb4. The temperature dependence of the nuclear quadrupolefrequency ($\nu_Q$), as well as the magnetic susceptibility, is well explainedby crystal electric field effects. The nuclear spin-lattice relaxation rate($T_1^{-1}$) of both $^{121}$Sb and $^{123}$Sb increases rapidly withdecreasing temperature. The ratio of $T_1^{-1}$ for the two Sb isotopes isconstant at high temperature but it decreases at low temperatures, indicatingthe important role of quadrupole fluctuations of the Ce ions. We propose thatquadrupole fluctuations could be the origin of the large specific heat at lowtemperature via phonon-quadrupole moment coupling.

Crystal field effects and quadrupole fluctuations in Ce$_3$Au$_3$Sb$_4$ detected by Sb NQR