Weak itinerant ferromagnetism in Heusler-type Fe2VAl0.95
Physical Review B
Number of pages
Faculty of Science (FNWI)
Van der Waals-Zeeman Institute (WZI)
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±3 K 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=12 mJ K−2 mol−1. The resistivity, ρ(T), is metallic
and follows a power law behavior ρ=ρ0+ATn with n≈1.5 below TC. With applying pressure, TC decreases with the rate of (1/TC)(dTC/dP)=−0.061 GPa−1.
We conclude substitution on the Al site with Fe and V atoms results in itinerant ferromagnetism with a low carrier density.
go to publisher's site
If you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let
the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible
and/or remove it from the website. Please Ask the Library, or send a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands.
You will be contacted as soon as possible.