Abstract
We have measured both the specific heat and the susceptibility of thesingle crystal PrCu6 in magnetic fields systematically for the firsttime. Our measurements performed in fields up to 4.2, T has revealed theanisotopy; the specific heat decreases with the field when the field isparallel to the b-axis. From the result of the susceptibility measurementperformed in fields up to 5, T, we show that the electronic specific heatcoefficient γ decreases from 16.1, mJ/K2·mol at zero fielddown to 15.5, mJ/K2·mol at 4.2, T when the field is applied alongthe b-axis. The increase of Δ up to 20.8, K at 4.2, T from 19.3, K atzero field has been obtained as well from our analysis, where Δ isthe energy separation between the ground state and the first excited state.On the other hand, γ and Δ remain unchanged for the fieldaligned along other orientation. We have concluded that the decrease of thespecific heat is attributed to the increase of Δ and to thereduction of γ.
