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Quantum size effect-induced heat capacity of metal nanoparticles at lowtemperatures was predicted 79 years ago to be exponential. This, however, hasnot been reported until date. In defiance, we demonstrate here observation ofexponentially decaying heat capacity, below 45.2 K, associated with quantumjumps, exceptionally in 4 nm naturally assembled hexagonal closed packed (hcp)lattice of nickel nanoparticles; high magnetic fields have negligible effect onthese features. Magnetic susceptibilities in contrast reveal evolution ofquantum size effects with decrease in particle size. They exhibit sharp risebelow about 30 K and vestiges of saturations below 5 K. The former is explainedby Curie-like characteristics of odd electrons while the latter tend towardsthe orthogonal even-like case. These characteristics, ascribed to the ensemblesof Ni nanoparticles, will give a new direction in understanding this crucialthermodynamic phenome-non.

Quantum Size Effect Exponential Heat Capacity in 4 nm Natural Nickel Nanolattice