Structure, Magnetism, and Superconductivity of the Layered Iron Arsenides Sr1-xNaxFe2As2

被引：23

作者：

Cortes-Gil, Raquel ^{[1
]}

Clarke, Simon J. ^{[1
]}

机构：

[1] Univ Oxford, Inorgan Chem Lab, Dept Chem, Oxford OX1 3QR, England

来源：

CHEMISTRY OF MATERIALS | 2011年 / 23卷 / 04期

关键词：

D O I：

10.1021/cm1028244

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The synthesis and evolution of the structure, magnetic ordering, and superconductivity of the layered iron arsenides Sr1-xNaxFe2As2 is reported. In the Sr1-xNaxFe2As2 solid solution, the limiting Na-rich composition in samples made using conventional solid state synthesis at elevated temperatures occurs at an unusually small value (x = 0.4) compared with other alkali-metal-doped alkaline earth iron arsenides. Above this limiting value of the sodium content, competing phases are formed: for x = 0.42, an elemental iron impurity is evident, and additional impurities appear for x>0.42. Superconductivity is detected in the compositions approaching the phase limit (T-c = 26 K for x = 0.4) in line with analogous isoelectronic materials. However, the magnetically ordered state which competes with the superconducting state appears not to be completely suppressed even at the limiting composition. The Na doping of SrFe2As2 is contrasted with the K-doping of SrFe2As2 and Na-doping of BaFe2As2 and other "122" iron arsenide compounds.

引用

页码：1009 / 1016

页数：8

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