Tetragonal to orthorhombic phase transition in SmFeAsO: a synchrotron powder diffraction investigation

Details Tetragonal to orthorhombic phase transition in SmFeAsO: a synchrotron powder diffraction investigation Tetragonal to orthorhombic phase transition in SmFeAsO: a synchrotron powder diffraction investigation

2008-08-07

arxiv.org/abs/0808.1024v1

Physics

Condensed Matter

Superconductivity

Submitted to: Superconductor Science and Technology PACS: 61.05.cp, 61.66.Fn, 74.10.+v, 74.62.Dh, 74.70.Dd

Scientific paper

The crystal structure of SmFeAsO has been 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 can be located at T about 140 K.

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