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(Sr 3Sc 2O 5)Fe 2As 2 as a possible parent compound for FeAs-based superconductors by Zhu, Xiyu; Han, Fei; Mu, Gang; Zeng, Bin; Cheng, Peng; Shen, Bing; Wen, Hai-Hu is a scholarly article available to read on EtoBox.

What is (Sr 3Sc 2O 5)Fe 2As 2 as a possible parent compound for FeAs-based superconductors about?

A new compound with the FeAs-layers, namely (Sr_3Sc_2O_5)Fe_2As_2 (abbreviated as FeAs-32522), was successfully fabricated. It has a layered structure with the space group of I4/mmm, and with the lattice constants a = 4.069 $\AA$ and c = 26.876 $\AA$. The in-plane Fe ions construct a square lattice which is close to that of other FeAs-based superconductors, such as REFeAsO (RE = rare earth elements) and (Ba,Sr)Fe_2As_2. However the inter FeAs-layer spacing in the new compound is greatly enlarged. The temperature dependence of resistivity exhibits a weak upturn in the low temperature region, but a metallic behavior was observed above about 60 K. The magnetic susceptibility shows also a non-monotonic behavior. Interestingly, the well-known resistivity anomaly which was discovered in all other parent compounds, such as REFeAsO, (Ba,Sr)Fe_2As_2 and (Sr,Ca,Eu)FeAsF and associated with the Spin-Density-Wave (SDW)/structural transition has not been found in the new system either on the resistivity data or the magnetization data. This could be induced by the large spacing distance between the FeAs-planes, therefore the antiferromagnetic correlation between the moments of Fe ions in neighbo

Author

Zhu, Xiyu; Han, Fei; Mu, Gang; Zeng, Bin; Cheng, Peng; Shen, Bing; Wen, Hai-Hu

Published

2008

Language

EN