Abstract
The effect of substituting different amounts of magnetic metal Fe on the magnetic properties of SmFexCr1−xO3 (0 < x < 0.5) is reported here in order to probe the relation between the structural distortion and magnetism in these materials. The structural properties of the samples were characterized using X-ray diffraction with Rietveld refinements, and Raman spectroscopy carried out at ambient temperature. Magnetization data reveals the Neel temperature (TN, where the Cr(Fe) ions order) increases with an increase in the average B-site ionic radius, and average Cr(Fe)–O–Cr(Fe) bond angle. By fitting the temperature dependence of the magnetic susceptibility to the Curie–Weiss law modified by the Dzyaloshinskii–Moriya (DM) interaction, the strengths of the symmetric and antisymmetric Cr(Fe)–Cr(Fe) exchange interactions (J and D) were determined. It was found that the strength of the symmetric interaction J (reflected in the changes in the Neel temperature) increases with the replacement of Cr3+ with Fe3+, which is ascribed to the changes in the average Cr(Fe)–O–Cr(Fe) bond angle and bond lengths. Meanwhile, the antisymmetric interaction D a slightly decreases, which may be ascribed to the displacement of oxygen ions (dO) away from their “original” middle point.
Highlights
Rare-earth (R) transition metal (M) orthorhombic perovskite materials with ABO3-type perovskite structures, such as orthochromites RCrO3, and orthoferrites RFeO3, have received great interest, and possess more than one ferroic order, for example, ferroelectricity (FE), ferromagnetism (FM), and ferroelasticity.[1,2] Perovskite structures can demonstrate a variety of functions because of the wide selection of elements they can incorporate, driving structural distortions that in uence the magnetic and electronic properties, and magnetoelectric properties.[3]
Polycrystalline samples SmFexCr1ÀxO3 (0 < x < 0.5) were compounded via a solid state reaction, and their structures were con rmed using X-ray diffraction (XRD) and Raman spectroscopy techniques, which reveal the evolution of the distorted perovskite structure with Fe substitution
Note that the bond angles increase with increasing Ravg
Summary
Rare-earth (R) transition metal (M) orthorhombic perovskite materials with ABO3-type perovskite structures, such as orthochromites RCrO3, and orthoferrites RFeO3, have received great interest, and possess more than one ferroic order, for example, ferroelectricity (FE), ferromagnetism (FM), and ferroelasticity.[1,2] Perovskite structures can demonstrate a variety of functions because of the wide selection of elements they can incorporate, driving structural distortions that in uence the magnetic and electronic properties, and magnetoelectric properties.[3].
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