X-ray-diffraction patterns at room temperature for Nb1− x Hf x Fe2. The patterns are shifted downwards from top (x = 0) to bottom (x = 0.80) for the sake of comparison.
Temperature dependence of magnetization under an external magnetic field H = 0.1 T from 2 to 300 K for Nb1− x Hf x Fe2 plotted by logarithmic x-axis scale, for the visual of the divarication of ZFC and FC curves at lower temperatures.
(Color online) Temperature dependence of ac susceptibility for NbFe2 at an ac field H ac = 10 Oe with different frequencies. The figure inset shows the time dependence of ZFC magnetization of NbFe2, with H = 0.1 T.
(Color online) (a) Magnetization curves of Nb1− x Hf x Fe2 measured at 4.2 K and 300 K up to 5 T. The Arrot plot is at T = 4.2 K for (b) x = 0.65 and (c) x = 0.
(Color online) Temperature dependence of ac susceptibility for Nb1− x Hf x Fe2 (x = 0.65) at an ac field H ac = 10 Oe with different frequencies, (a) the real part and (b) the imaginary part. The arrow marks the direction of movement of the hump. The inset shows frequency dependence of the spin freezing temperature Tf . The solid line is the linear fit to the Tf data.
(Color online) Temperature dependence of specific heat for (a) x = 0, and (b) x = 0.65. The figure insets show low-temperature specific-heat data in the plot of C/T versus T 2. The solid line is the fitting curve using the formula C/T = γ SG + βT2. The arrows mark the approximate location of T N and Tf for two samples, respectively.
Crystal structure of C14 Laves phase AFe2 compounds. The atom number ratio Fe(6h):Fe(2a) = 3:1. The arrow marks the direction of c-axis.
(Color online) Schematic diagram of the spin configuration for (a) the FM arrangement of Fe spins and (b) the frustration of Fe(2a). Only Fe atoms are shown and the 2a and 6h rows are as indicated. The arrow marks the direction of c-axis.
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