Abstract
It has been known that the Heusler compound Fe\(_{3-x}\)Mn\(_x\)Si has a complex magnetic phase diagram. For 0.75 \( \le x \le \) 1.75, it exhibits a ferromagnetic transition at \(T_\textrm{C }\), and at a lower temperature \(T_\textrm{A}\), another transition to a phase with both ferromagnetic and antiferromagnetic components. Recently, however, magnetization and specific heat measurements revealed that for \(x=\) 1.7, yet another transition occurs at a temperature lower than \(T_\textrm{A}\), i.e., there are three transitions at zero magnetic field. In our previous study, the nature of the ordered phases and transitions for \(x =\) 1.7 and 1.68 were investigated using Mössbauer spectroscopy, and the existence of a hyperfine field \(B_\textrm{hf}\) was confirmed. This demonstrates that the low temperature phases are magnetically ordered phases. In this study, to further investigate the ordered phases and transitions in Fe\(_{3-x}\)Mn\(_x\)Si, we measure Mössbauer spectra for x = 1.8 and 1.9, where only a single antiferromagnetic transition appears to exist as judged from magnetization measurements, and the transition temperature is defined as \(T_\textrm{A2}'\). The spectra show that \(B_\textrm{hf}\) is present for \(x=\) 1.8 and 1.9 at low temperatures, and the values of \(B_\textrm{hf}\) are comparable with that for x = 1.7. With increasing temperature T, \(B_\textrm{hf}\) decreases smoothly, and at \(T>T_\textrm{A2}'\) the spectrum becomes a singlet and \(B_\textrm{hf}\) is zero. These results confirm the existence of magnetic order for x = 1.8 and 1.9.
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Acknowledgements
Part of this study was performed using the facilities of the Materials Design and Characterization Laboratory in the Institute for Solid State Physics, the University of Tokyo.
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M.H. wrote the main manuscript and prepared all figures. M.O. performed Mössbauer spectroscopy measurements. T.T. prepared samples and measured magnetization. I.S. discussed results and supported the experiments. All authors reviewed the manuscript.
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Hiroi, M., Takamoto, T., Shigeta, I. et al. Mössbauer study of magnetically ordered states in Heusler compounds Fe\(_{3-x}\)Mn\(_x\)Si. Interactions 245, 58 (2024). https://doi.org/10.1007/s10751-024-01903-3
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DOI: https://doi.org/10.1007/s10751-024-01903-3