NUCLEAR-MAGNETIC-RESONANCE STUDIES OF CEPD2IN AND LAPD2IN AT LOW-TEMPERATURES

We report on In nuclear magnetic resonance (NMR) and nuclear quadrupol ar resonance (NQR) measurements on the new heavy-electron compound CeP d2In over a wide temperature range, from 45 mK up to 30 K. CePd2In und ergoes an antiferromagnetic (AF) phase transition at T-N = 1.23 K invo lving small localised Ce moments of 0.11 mu(B) In zero field, the spin -lattice relaxation rate T-1(-1) (T) shows remarkable changes in its t emperature dependence. Above 3 K, T-1(-1) is constant and 850 sec(-1). Between T-N and 2T(N), (T1T)(-1) = 330 (Ksec)(-1), but rapidly decrea ses below T-N. A Korringa-type relaxation, characteristic for simple m etals at low temperatures, with (T1T)(-1) = 17(Ksec)(1) is resumed bel ow 0.6 K. This value is an order of magnitude larger than (T1T)(-1) fo r LaPd2In and therefore is associated with low-energy excitations of t he itinerant charge carriers with 4f symmetry. The T-1(-1) data at var ious non-zero magnetic fields fall on a single curve when plotted as a function of (T/H) if H exceeds 3.5 T. Thus the AF ordering, the 4f mo ment fluctuations and the Kondo screening are drastically suppressed b y the application of fields H of the order of 3.5 T.