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Thermal and transport properties of Hf1-xTaxFe2.

We report the results of specific-heat and electrical-resistivity measurements of Hf 1-x Ta x Fe x , which show a magnetic transition from a ferromagnetic (F) to an antiferromagnetic (AF) state with increasing temperature at x=0.2. A sharp peak was observed in the specific-heat curve of x=0. 2 at 140 K. The corresponding entropy change due to the F-AF transition is estimated as 1.2 J/K mol. The electronicspecific-heat coefficient γ and the coefficient of the T 2 term in the resistivity, A, are very enhanced in the AF state due to spin fluctuations. Topological frustration is proposed as an origin of spin fluctuations