Low-temperature order in the heavy-fermion compound CeCu6.
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We have used nuclear-quadrupole-resonance (NQR) techniques to study Cu nuclei in two single-crystal samples of CeCu6 between 200 K and 20 mK. We present measurements of the NQR intensities and spin-lattice relaxation times, T1, at frequencies corresponding to three different sites in the crystal. Below 5 mK we observe deviations from standard metallic behavior in both signal intensity and spin-lattice relaxation times. These deviations are unusual in that they are site dependent; they reveal the presence of one or more types of order in this system. 1995 The American Physical Society.