Abstract
We investigated antiferromagnetic transitions of R5lr4Si10 (R=Tb, Dy, Ho, Er) by measuring the low-temperature specific heat. The antiferromagnetic transition temperature TN is precisely determined. TN is l0.7K for R=Tb, TN is 5.8K for R=Dy, TN is 5.1K for R=Ho and TN is 3.5K for R=Er, respectively. These results suggest that the antiferromagnetic transition of the ternary rare-earth metal silicide R5lr4Si10 is dominated by the exchange interaction between R3+ ions like as the antiferromagnetic transitions in the ternary rare-earth metal compounds RCu2Ge2 (R=rare-earth metal). In addition, we report the upturn of the specific heat below 1.5K observed for R=Tb and Ho.
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