Abstract
We investigated temperature, T, dependence of magnetization, M(T), electrical resistivity, ρ(T), and specific heat, Cp(T), for the Heusler compound Fe2VSi. M(T) shows anomalies at TN1 ∼ 115 K and at TN2 ∼ 35 K. The anomaly at TN1 is caused by the magnetic transition with a crystal structural change. On the other hand, ρ(T) and Cp(T) show only anomaly at TN1, and no trace of anomaly at TN2 is observed. Because of the irreversibility of M(T), which is the characteristic of spin-glass freezing, appears below TN2, a spin-glass freezing may occur at TN2. From the analogy of the Heusler compound (Fe1−xVx)3Si with the cubic D03 crystal structure, (0 ≤ x ≤ 0.2), we suggested that the atomic disorder of V site by the Fe atoms gives rise to the magnetic frustration. This could be cause for the spin-glass freezing. By the Clausius-Clapeyron relation, pressure, P, derivative of TN1, (dTN1dP), is estimated to be ∼−10 K/Gpa.
Highlights
Heusler compounds have been investigated intensively because they have many attractive physical properties, a magnetic-field-induced shape memory,[1] half-metallicity,[2,3] and high thermopower,[4] for example
From the analogy of the Heusler compound (Fe1−xVx)3Si with the cubic D03 crystal structure, (0 ≤ x ≤ 0.2), we suggested that the atomic disorder of V site by the Fe atoms gives rise to the magnetic frustration
Matsuda et al observed the additional anomaly of magnetization at T N 2 ∼ 34 K, suggesting another magnetic phase transition,[9] and pointed out that Fe moments located on V site due to the atomic disorder play an important part in the magnetic order below T N 2
Summary
Heusler compounds have been investigated intensively because they have many attractive physical properties, a magnetic-field-induced shape memory,[1] half-metallicity,[2,3] and high thermopower,[4] for example. A couple decades ago, Nishino et al investigated the Heusler compound Fe3Si with a cubic D03 structure and (Fe1−xMx)3Si, (M = Ti, V, Cr, Mn, Co, and Ni), by means of electrical resistivity, and reported that the ferromagnetic transition occurs in the range 0 ≤ x ≤ 0.2, for M = V.5. Ternary Heusler compound Fe2VSi has a cubic L21 crystal structure with Fm3m space group. The X-ray powder diffraction analysis was carried out by Kawakami et al.[7,8] They reported that, with decreasing temperature, the crystal structural change from the cubic to the tetragonal symmetry (namely, 1st-order transition) occurs at T N 1 concurrent with the magnetic phase transition. The detail of the origin of the anomaly at T N 2, still is not understood well
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