Structural properties, defects and structural phase transition in the ROFeM (R=La, Nd; M=As, P) materials

Details Structural properties, defects and structural phase transition in the ROFeM (R=La, Nd; M=As, P) materials Structural properties, defects and structural phase transition in the ROFeM (R=La, Nd; M=As, P) materials

2008-06-19

arxiv.org/abs/0806.3159v1

Physics

Condensed Matter

Superconductivity

17 pages, 6 figures

Scientific paper

10.1209/0295-5075/84/47002

The structural properties of the ROFeM (R=La, Nd; M=As, P) materials have been analyzed by means of electron diffraction, high-resolution transmission-electron microscopy (TEM) and in-situ cooling TEM observations. The experimental results demonstrate that the layered ROFeM crystals often contain a variety of structural defects, such as stacking faults and small-angle boundaries. The in-situ TEM investigations reveal that, in association with the remarkable spin-density-wave (SDW) instability near 150 K, complex structural transitions can be clearly observed in both crystal symmetry and local microstructure features.

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