Superparamagnetism in nanocrystalline CePd_3: Bulk magnetization and TDPAC studies

摘要

We report magnetization and ~(111)Cd hyperfine field studies in ball milled nanocrystalline CePd_3, measured via time differential perturbed angular correlation (TDPAC) spectroscopy. Compared to the Pauli paramagnetic behavior of bulk CePd_3, the nanocrystalline samples show enhanced magnetization with field dependence akin to superparamagnetic behavior. This observation is supported by hyperfine field of ~(111)Cd which show temperature dependent large Knight-shifts whose magnitude increases with reduction of particle size.