Abstract
The magnetic properties of (Cr1-xFex)3Te4 with the pseudo-NiAs type structure have been studied. The ferromagnetic transition temperatures (Tc) for the compounds are found to decrease with substitution of Fe for Cr, from the magnetization measurements. From the variation of Tc with x, monoclinic (Cr1-xFex)3Te4 (x = 0 ∼ 0.04) and hexagonal (Cr1-xFex)3Te4 (x ∼ 0.15) are found to be stable at room temperature, and the solubility limit of the iron-rich side for the hexagonal (Cr1-xFex)3Te4 is estimated to be x = 0.18. A weak antiferromagnetic transition has been found for monoclinic (Cr1-xFex)3Te4 (x = 0 ∼ 0.04). The critical Fe concentration (x) at which the antiferromagnetic transition disappears in (Cr1-xFex)3Te4 is estimated to be x = 0.08. In the range x = 0 ∼ 0.02, the saturation magnetization for (Cr1-xFex)3Te4 increases with x due to the substitution of Fe, which has a larger magnetic moment than Cr. Above x = 0.04, the saturation magnetization decreases with increasing x, which is considered to be due to decreased magnetic interaction between metal atoms as a result of the Fe substitution for Cr. From the variation of the saturation magnetization for (Cr1-xFex)3Te4 with x , the solubility limit of the iron-rich side for hexagonal (Cr1-xFex)3Te4 is estimated to be x = 0.18.
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