Electrical Resistivity Anomaly and Magnetic Properties in Heusler-Type Fe<SUB>2</SUB>VAl Alloy

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  • Sumi Hirofumi
    Department of Materials Science and Engineering, Nagoya Institute of Technology
  • Kato Masaaki
    Department of Materials Science and Engineering, Nagoya Institute of Technology
  • Nishino Yoichi
    Department of Materials Science and Engineering, Nagoya Institute of Technology
  • Asano Shigeru
    Department of Materials Science and Engineering, Nagoya Institute of Technology
  • Mizutani Uichiro
    Department of Crystalline Materials Science, Nagoya University

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  • ホイスラー型Fe<SUB>2</SUB>VAl合金の電気抵抗異常と磁性
  • ホイスラー型Fe2VAl合金の電気抵抗異常と磁性
  • ホイスラーガタ Fe2VAl ゴウキン ノ デンキ テイコウ イジョウ ト ジセイ

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Abstract

We have measured the temperature dependence of electrical resistivity, specific heat and magnetization of (Fe1−xVx)3Al alloys with V compositions 0.33≤x≤0.36. The near-stoichiometric Fe2VAl (x=0.33) exhibits a semiconductor-like behavior with the resistivity reaching 30 μΩm at 4.2 K. When the V composition deviates slightly from stoichiometry, the low-temperature resistivity is reduced to only 3 μΩm for x=0.34, showing a positive slope in its temperature dependence below 300 K, but turns to increase remarkably for x>0.34. Plots of the specific heat over temperature, C⁄T, versus T2 for x=0.33 show an anomalous upturn with decreasing temperature, and the magnetization data provide an evidence of local moment magnetism. In contrast, the enhancement of the specific heat and magnetization is considerably suppressed for x=0.34, being consistent with recent band calculations which predict that Fe2VAl is a nonmagnetic semimetal. The semiconductor-like resistivity behavior is most likely caused by strong spin fluctuations of Fe impurities on the nominally V site in Fe2VAl.

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