丁香园AV

Synopsis

The single crystal growth and the physical properties of the rare-earth based ternary intermetallic compounds RNi₄Cd (R = Y and Yb) will be presented. The powder X-ray diffraction measurement reveals that these compounds crystallize in the face-centered cubic (fcc), MgCu₄Sn-type structure (space group F-43m). Magnetization, electrical resistivity, and specific heat measurements are used to study thermodynamic and transport properties of YbNi₄Cd. The magnetic susceptibility shows that 4f electrons of Yb3+ ions are well localized. The electrical resistivity and specific heat exhibits an antiferromagnetic ordering below T_N = 0.97 K. Applying a field along [111] direction results in the suppression of T_N below 0.4 K at the critical field H_c ~ 4.5 kOe. No non-Fermi liquid behavior is observed in the vicinity of Hc. Above H_c, the magnetoresistivity shows an unconventional temperature dependence 蚁 (T) = 蚁₀+ ATⁿ with n > 2, suggesting that an additional scattering mechanism in the resistivity needs to be considered. Based on the analysis of experimental results, we conclude that the Yb3+ moments and conduction electrons are weakly coupled. Despite the antiferromagnetic ordering below TN, YbNi4Cd exhibits a large frustration parameter |胃_p/T_N| ~ 16, where the magnetic Yb3+ ions occupy the tetrahedra on the fcc lattice.