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A crystallographic phase transition within the magnetically ordered state of Ce_2Fe_17

A. Kreyssig·S. Chang·Y. Janssen·J. -W. Kim·S. Nandi·J. Q. Yan·L. Tan·R. J. McQueeney·P. C. Canfield·A. I. Goldman
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Abstract

X-ray diffraction experiments were performed on polycrystalline and single-crystal specimens of Ce$_{2}$Fe$_{17}$ at temperatures between 10 K and 300 K. Below $T_{\mathrm{t}}$ = 118$\pm$2 K, additional weak superstructure reflections were observed in the antiferromagnetically ordered state. The superstructure can be described by a doubling of the chemical unit cell along the $\mathbf{c}$ direction in hexagonal notation with the same space group $R \bar{3} m$ as the room-temperature structure. The additional antiferromagnetic satellite reflections observed in earlier neutron diffraction experiments can be conclusively related to the appearance of this superstructure.

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A. Kreyssig, S. Chang, Y. Janssen, J. -W. Kim, S. Nandi, J. Q. Yan, L. Tan, R. J. McQueeney, P. C. Canfield, A. I. Goldman. 2006-12-30. A crystallographic phase transition within the magnetically ordered state of Ce_2Fe_17. https://doi.org/10.1103/physrevb.76.054421

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