Hyperfine Interactions of ~(111)Cd in Some Rare Earth Laves Phases RT_2 (T = Mn, Fe)

摘要

Radioactive ~(111)In was introduced into the Laves phases YMn_2, GdFe_2 and YbFe_2 synthesized under pressure of 8 GPa, and the hyperfine interaction of the daughter ~(111)Cd was measured by the perturbed angular correlation method. In the obtained hexagonal (C14) phase YMn_2 ~(111)In is substituted for Mn, predominantly at h-sites, experiencing there an electric quadrupole interaction with #upsilon#_Q = 32.0(5) MHz and #eta# = 0.51(5) at 300 K. In GdFe_2 and YbFe_2 (cubic C15) most of the ~(111)In-~(111)Cd probes (approx= 80%) substituted mainly for the rare earth atoms and experienced a magnetic hyperfine field B_(hf) = 2.92(4) T and 3.32(7) T, respectively, at 300 K. The results are discussed together with the published data for the normal cubic YMn_2, and for LuFe_2 and ZrFe_2.