Reentrant ferromagnetism observed in SmMn2Ge2 |
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| Authors: | H. Fujii T. Okamoto T. Shigeoka N. Iwata |
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| Affiliation: | Faculty of Integrated Arts and Sciences, Hiroshima University, Hiroshima 730, Japan;Faculty of Science, Yamaguchi University, Yamaguchi 753, Japan |
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| Abstract: | Magnetic characteristics of SmMn2Ge2 with a layer structure have been studied by magnetization measurements using single crystal. In the sequence of decreasing temperature, ferromagnetism is observed at 196 K ? T ? 348 K, collinear antiferromagnetism becomes stable for 64 K ? T < 196 K and reentrant ferromagnetism appears below 64 K. The appearance of such successive magnetic orderings are attributed to the variation of the shortest Mn-Mn distance due to thermal expansion and the existence of ferromagnetic coupling between the Sm moments in the intralayer which is dominant at low temperatures. |
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