Structural properties and phase transition of RFeMO (R = La, Nd; M = As, P) materialsC. Ma, L. J. Zeng, H. X. Yang, H. L. Shi, R. C. Che, C. Y. Liang, Y. B. Qin, G. F. Chen, Z. A. Ren and J. Q. Li
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences - Beijing 100080, China
received 4 August 2008; accepted in final form 5 October 2008; published November 2008
published online 10 November 2008
The structural properties of RFeMO (R = La, Nd; M = As, P) materials were analyzed by transmission electron microscopy (TEM), revealing that the layered RFeMO crystals often contain a variety of structural defects, such as stacking faults and small-angle boundaries. In situ TEM observations revealed a remarkable spin density wave (SDW) instability near 150 K, and associated complex structural transitions can be clearly observed in both crystalline symmetry and local microstructural features.
74.70.Dd - Ternary, quaternary, and multinary compounds (including Chevrel phases, borocarbides, etc.).
61.72.Ff - Direct observation of dislocations and other defects (etch pits, decoration, electron microscopy, X-ray topography, etc.).
61.05.J- - Electron diffraction and scattering.
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