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.
@article{arxiv.0806.3159,
title = {Structural properties, defects and structural phase transition in the ROFeM (R=La, Nd; M=As, P) materials},
author = {C. Ma and L. J. Zeng and H. X. Yang and H. L Shi and R. C. Che and C. Y. Liang and Y. B. Qin and G. F. Chen and Z. A. Ren and J. Q. Li},
journal= {arXiv preprint arXiv:0806.3159},
year = {2009}
}