Thermal and transport properties of Hf1-xTaxFe2

Hirofumi Wada, N. Shimamura, M. Shiga

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)10221-10226
Number of pages6
JournalPhysical Review B
Volume48
Issue number14
DOIs
Publication statusPublished - Jan 1 1993
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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