TY - JOUR
T1 - Thermal and transport properties of Hf1-xTaxFe2
AU - Wada, H.
AU - Shimamura, N.
AU - Shiga, M.
PY - 1993
Y1 - 1993
N2 - We report the results of specific-heat and electrical-resistivity measurements of Hf1-xTaxFex, 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 electronic-specific-heat coefficient γ and the coefficient of the T2 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. It was found that the Laves-phase compounds with strong spin fluctuations satisfy the Kadowaki-Woods relation A/γ2=1.0×10-5 μΩ cm(K mol/mJ)2 as well as the heavy-fermion systems do. The results are discussed on the basis of spin-fluctuation theory.
AB - We report the results of specific-heat and electrical-resistivity measurements of Hf1-xTaxFex, 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 electronic-specific-heat coefficient γ and the coefficient of the T2 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. It was found that the Laves-phase compounds with strong spin fluctuations satisfy the Kadowaki-Woods relation A/γ2=1.0×10-5 μΩ cm(K mol/mJ)2 as well as the heavy-fermion systems do. The results are discussed on the basis of spin-fluctuation theory.
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U2 - 10.1103/PhysRevB.48.10221
DO - 10.1103/PhysRevB.48.10221
M3 - Article
AN - SCOPUS:0000127290
VL - 48
SP - 10221
EP - 10226
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 0163-1829
IS - 14
ER -