Study of the antiferromagnetic phase in Sm(Mn1−xCrx)2Ge2 |
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Authors: | Shibaji Saha Naushad Ali |
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Affiliation: | Department of Physics and Molecular Science Program, Southern Illinois University at Carbondale, Carbondale, IL 62901 USA |
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Abstract: | Magnetic and thermal expansion measurements have been carried out on the polycrystalline Sm(Mn1?xCrx)2Ge2 samples to see how the antiferromagnetie (AFMII) region in SmMn2Ge2 is affected by Cr substitution. It is found that the antiferromagnetic region disappears for samples with less than 2 at.% of Cr. Sharp changes in the thermal expansivity (Δl/l) at FMI–AFMII and AFMII–FMII transitions are observed, indicating first order transitions. The decrease in relative thermal expansivity at the two transitions with the increase of Cr concentration is related to the decrease in the stability and the temperature-range of the AFMII phase observed in magnetization measurements. A spin reorientation transition (TSR) has been observed for x=0, at 148 K. It is found that the TSR increases with the increase of Cr concentration. A magnetic phase diagram as a function of Cr concentration in Sm(Mn1?xCrx)2Ge2 has been constructed. |
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