A crystallographic phase transition within the magnetically ordered state of Ce2Fe17
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
Abstract
X-ray diffraction experiments were performed on polycrystalline and single-crystal specimens of Ce2Fe17 at temperatures between 10 K and 300 K. Below Tt = 1182 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 c direction in hexagonal notation with the same space group R 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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