Abstract
The crystal structure of SmFeAsO was investigated by means of Rietveld refinement of high-resolution synchrotron powder diffraction data collected at 300 K and 100 K. The compound crystallizes in the tetragonal P4/ nmm space group at 300 K and in the orthorhombic Cmma space group at 100 K; attempts to refine the low temperature data in the monoclinic P112/ n space group diverged. On the basis of both resistive and magnetic analyses the tetragonal to orthorhombic phase transition may be located at T ∼ 140 K.
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