Document Detail


Pressure-Induced Isostructural Phase Transition and Correlation of FeAs Coordination with the Superconducting Properties of 111-Type Na(1-x)FeAs.
MedLine Citation:
PMID:  21528857     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The effect of pressure on the crystalline structure and superconducting transition temperature (T(c)) of the 111-type Na(1-x)FeAs system using in situ high-pressure synchrotron X-ray powder diffraction and diamond anvil cell techniques is studied. A pressure-induced tetragonal to tetragonal isostructural phase transition was found. The systematic evolution of the FeAs(4) tetrahedron as a function of pressure based on Rietveld refinements on the powder X-ray diffraction patterns was obtained. The nonmonotonic T(c)(P) behavior of Na(1-x)FeAs is found to correlate with the anomalies of the distance between the anion (As) and the iron layer as well as the bond angle of As-Fe-As for the two tetragonal phases. This behavior provides the key structural information in understanding the origin of the pressure dependence of T(c) for 111-type iron pnictide superconductors. A pressure-induced structural phase transition is also observed at 20 GPa.
Authors:
Qingqing Liu; Xiaohui Yu; Xiancheng Wang; Zheng Deng; Yuxi Lv; Jinlong Zhu; Sijia Zhang; Haozhe Liu; Wenge Yang; Lin Wang; Hokwang Mao; Guoyin Shen; Zhong-Yi Lu; Yang Ren; Zhiqiang Chen; Zhijun Lin; Yusheng Zhao; Changqing Jin
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-4-29
Journal Detail:
Title:  Journal of the American Chemical Society     Volume:  -     ISSN:  1520-5126     ISO Abbreviation:  -     Publication Date:  2011 Apr 
Date Detail:
Created Date:  2011-5-2     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7503056     Medline TA:  J Am Chem Soc     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Institute of Physics, Chinese Academy of Sciences , Beijing 100190, China.
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