Abstract
Eleven new compounds, R Ni2Cd20 (R=Y, La–Nd, Sm, Gd, Tb) and R Pd2Cd20 (R=Ce, Pr, Sm), were grown as single crystals in high temperature cadmium-rich solutions. They crystallize in the cubic CeCr2Al20-type structure (Fd3¯m, Z=8) as characterized by measurements of powder X-ray diffraction. Electrical resistivity, magnetization, and specific heat measurements were performed on R Ni2Cd20 (R=Y, La–Nd, Sm, Gd, Tb) single crystals. Whereas YNi2Cd20 and LaNi2Cd20 exhibit unremarkable metallic behavior, when magnetic moments from localized 4f electron states (Gd3+–Tb3+) are embedded into this host, they exhibit ferromagnetic order with values of the Curie temperature TC for R Ni2Cd20 (R=Gd, and Tb) which scale with the de Gennes factor.
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