Magnetoelastic properties of ErMn6Sn6 intermetallic compound |
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Authors: | Sh. Tabatabai YazdiN. Tajabor M. Rezaee RoknabadiM. Behdani F. Pourarian |
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Affiliation: | a Department of Physics, Faculty of Sciences, Ferdowsi University of Mashhad, Mashhad 91775-1436, Iran b Department of Materials Science & Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA |
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Abstract: | The thermal expansion and magnetostriction of polycrystalline sample of the ErMn6Sn6 intermetallic compound with hexagonal HfFe6Ge6-type structure are investigated in the temperature range of 77 K to above 400 K. The thermal expansion measurement of the sample shows anomalous behavior around its TN=340 K. The isofield curves of volume magnetostriction also reveal anomalies at paramagnetic-antiferromagnetic and antiferromagnetic-ferrimagnetic phase transitions. In the antiferromagnetic state, the transition to ferrimagnetism can be induced by an applied magnetic field. The threshold field for the metamagnetic transition Hth increases from 0.18 T at 84 K to about 1 T around 220 K, and then decreases monotonously to TN. This behavior is well consistent with that observed earlier on magnetization curves attributed to exchange-related metamagnetic transition rather than the anisotropy-related one. Furthermore, the low Hth values suggest that the Mn-Mn coupling in ErMn6Sn6 is not so strong. The experimental results obtained are discussed in the framework of two-magnetic sublattice by bearing in mind the lattice parameter dependence of the interlayer Mn-Mn exchange interaction in this layered compound. From the temperature dependence of magnetostriction values and considering the magnetostriction relation of a hexagonal structure, we attempt to determine the signs of some of the magnetostriction constants for this compound. |
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Keywords: | Rare-earth intermetallic compound Magnetic phase transition Magnetostriction Thermal expansion |
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