Magnetic Properties and de Gennes Scaling of Quaternary Intermetallic Compounds

The interplay between antiferromagnetism and superconductivity has been studied for the quaternary intermetallic superconductor R_1-xR’_xNi₂B₂C systems from the isothermal magnetization curves and temperature dependent magnetization measurements to determine the crystalline field effect such as low energy levels of singlet Γ₄ and excited Γ₁ and Γ₅ in theoretical group analysis of the energy scheme. In addition, by using the R⁺³ ions Hund’s rule, we have qualitative agreement between the de Gennes T_N scaling behavior and crystalline electric effect scheme.