Weak itinerant ferromagnetism in Heusler-type Fe2VAl0.95

K. Sato, T. Naka, M. Taguchi, T. Nakane, F. Ishikawa, Y. Yamada, Y. Takaesu, T. Nakama, A. de Visser, and A. Matsushita
Phys. Rev. B 82, 104408 – Published 8 September 2010

Abstract

We report measurements of the magnetic, transport, and thermal properties of the Heusler-type compound Fe2VAl0.95. We show that while stoichiometric Fe2VAl is a nonmagnetic semimetal a 5% substitution on the Al site with the 3d elements Fe and V atoms leads to a ferromagnetic ground state with a Curie temperature TC=33±3K and a small ordered moment μs=0.12μB/Fe in Fe2VAl0.95. The reduced value of the ratio μs/μp=0.08, where μp=1.4μB/Fe is the effective Curie-Weiss moment, together with the analysis of the magnetization data M(H,T), show magnetism is of itinerant nature. The specific heat shows an unusual temperature variation at low temperatures with an enhanced Sommerfeld coefficient, γ=12mJK2mol1. The resistivity, ρ(T), is metallic and follows a power law behavior ρ=ρ0+ATn with n1.5 below TC. With applying pressure, TC decreases with the rate of (1/TC)(dTC/dP)=0.061GPa1. We conclude substitution on the Al site with Fe and V atoms results in itinerant ferromagnetism with a low carrier density.

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  • Received 11 May 2010

DOI:https://doi.org/10.1103/PhysRevB.82.104408

©2010 American Physical Society

Authors & Affiliations

K. Sato1, T. Naka1,*, M. Taguchi1, T. Nakane1, F. Ishikawa2, Y. Yamada3, Y. Takaesu4, T. Nakama4, A. de Visser5, and A. Matsushita1

  • 1National Institute of Materials Science, Tsukuba, Sengen 1-2-1, Tsukuba, Ibaraki 305-0047, Japan
  • 2Graduate School of Science and Technology, Niigata University, 8050, Igarashi Niigata 950-2181, Japan
  • 3Department of Physics, Faculty of Science, Niigata University, 8050, Igarashi Niigata 950-2181, Japan
  • 4Faculty of Science, University of the Ryukyus, Nishihara, Okinawa 903-0213, Japan
  • 5Van der Waals-Zeeman Institute, University of Amsterdam, Valckenierstraat 65, Amsterdam 1018 XE, The Netherlands

  • *Corresponding author. FAX: +81-29-859-2701; naka.takashi@nims.go.jp

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Issue

Vol. 82, Iss. 10 — 1 September 2010

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