We have performed measurements of the low-temperature specific heat for T=0.7--20 K and magnetic susceptibility for T=1.8--300 K of Pd nanocrystals with average particle size 84 {}. An enhancement of the specific heat is observed at temperatures T>3.5 K for 84-{} Pd nanocrystals. This enhancement is primarily related to the softening of and the size effect on the phonons. The temperature coefficient of specific heat {γ} decreases to a lower value as compared to that of bulk Pd. An estimated surface coefficient of specific heat γₛ is about 30% that of the bulk. This is also reflected in a reduction of the magnetic susceptibility of the Pd nanocrystals. The peak of the magnetic susceptibility observed at {~}80 K in bulk Pd is not observed in the nanocrystals; this could be due to a change of the energy band structure in the Pd nanocrystals.
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Chen et al. (1995) studied this question.
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