Abstract
Single crystals of ZrTr2Zn20 (Tr = Mn, Co, Ru) with a cubic CeCr2Al20-type structure (space group Fd-3m) were grown by a Zn-flux method. Electrical resistivity ρ(T) of ZrTr2Zn20 shows typical metallic behavior with the residual resistivity ratio (RRR) of 1.1 (Mn), 8.4 (Co) and 10 (Ru). Magnetic susceptibility χ(T) of ZrRu2Zn20 shows large diamagnetism. χ(T) of ZrTr2Zn20 (Tr = Mn, Co) clearly shows Curie-Weiss behavior, indicating that Mn/Co spins are really active as local magnetic moments or that a large spin fluctuation exists. χ(T) of ZrMn2Zn20 increases ferromagnetically at around 20 K. Because the anti-ferromagnetic correlation with active localized spins exists in ZrCo2Zn20, geometrical frustration of the pyrochlore lattice of Co is expected. However, specific heat C(T) of ZrCo2Zn20 shows no upturn at low temperatures and Sommerfeld coefficient γ is evaluated to be 24.8 mJ/(mol K2). We consider that the localized Co spins are insufficient to cause anomaly originated from the geometrical frustration, or the Co spins exist in a disordered arrangement of excess Co.
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