Tetragonal to Orthorhombic Transition of GdFeAsO Studied by Single-Crystal Synchrotron X-Ray Diffraction

F. Nitsche; Th. Doert; M. Ruck

doi:10.1016/j.solidstatesciences.2013.02.022

Tetragonal to Orthorhombic Transition of GdFeAsO Studied by Single-Crystal Synchrotron X-Ray Diffraction

Superconductivity 2015-06-11 v1

Authors: F. Nitsche , Th. Doert , M. Ruck

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Abstract

A study of the tetragonal to orthorhombic phase transition of GdFeAsO is presented. Planes of the reciprocal space were reconstructed form single-crystal synchrotron X-ray diffraction data. By cooling below the structural transition temperature splitting of the Bragg reflections was observed corresponding to four different twin domain orientations. A model was developed to quantify the distortion of the lattice from the position of the splitted reflections relative to each other. Constrained 2D-Cauchy fits of several splitted reflections provided positions of the reflections. The influence of the structural distortion was detectable already above the structural transition temperature hinting at fluctuations in the tetragonal phase.

Keywords

GdFeAsO tetragonal to orthorhombic transition single-crystal synchrotron X-ray diffraction bragg reflection splitting twin domains lattice distortion structural fluctuations

Cite

@article{arxiv.1208.1735,
  title  = {Tetragonal to Orthorhombic Transition of GdFeAsO Studied by Single-Crystal Synchrotron X-Ray Diffraction},
  author = {F. Nitsche and Th. Doert and M. Ruck},
  journal= {arXiv preprint arXiv:1208.1735},
  year   = {2015}
}

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6 pages, 6 figures

Tetragonal to Orthorhombic Transition of GdFeAsO Studied by Single-Crystal Synchrotron X-Ray Diffraction

Abstract

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