MAGNETIC-SUSCEPTIBILITY AND LOW-TEMPERATURE SPECIFIC-HEAT OF PALLADIUM NANOCRYSTALS

The specific heat and magnetic susceptibility of nanocrystalline Pd wi th an average particle size around 80 Angstrom as well as of bulk Pd w ere investigated as a function of temperature between 1 and 20 K, and between 1.8 and 300 K, respectively. A quadratic temperature term of t he specific heat was observed in nanocrystalline Pd but not in bulk Pd . In Pd nanocrystals the temperature coefficient of the electronic (/p hononic) specific heat is smaller (/larger) than;hose in bulk Pd. The peak of the magnetic susceptibility observed in bulk Pd near 80 K disa ppeared in nanocrystalline Pd. These results suggest that the variatio n of the energy band near the Fermi surface is steeper in nanocrystall ine Pd than in bulk Pd.