Size dependence of heavy-fermion behavior in CeAl2

Heavy-fermion compound CeAl2 has a Kondo temperature T-K of 5 K and a Neel temperature T-N of 3.8 K. As the dimensions of specimen decrease, the size effect was shown as the suppression of Tli and the magnitude of antiferroma gnetic anomaly in specific heat. For 80 Angstrom nanoparticles the magnitud e of gamma extrapolates to 9500 mJ/K-2 mole at absolute zero, whose value f alls in the highest range ever reported for heavy-fermion systems. (C) 2000 Elsevier Science B.V. All rights reserved.