The Crystalline Electric Field Effect of Doped Quaternary Intermetallic Compounds

The temperature dependent magnetization data have been measured for the (R$_{x}$,R'$_{1-x})$Ni$_{2}$B$_{2}$C system with the two different applied magnetic fields (H$\parallel $and $\bot $ c-axis) where R and R' stand for the rare earth elements. Especially from the high temperature region of data, the dominant Stevens parameter B$_{2}^{0}$ of crystalline electric field effect were analyzed for the R = Ho and R' = Dy system. The broad minimum determined from the magnetization anisotropy in Stevens parameters was observed around x $\sim $ 0.3 system where T$_{c}$(superconducting critical temperature) and T$_{N}$ (N\"eel temperature) are similar and the deviation from de-Gennes scaling in T$_{c}$ versus de-Gennes factor of rare earth elements was observed. The minimum and change of B$_{2}^{0}$ will be compared and discussed with the crystalline electric field effects and pair breaking effect by some magnetic excitations.