期刊
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
卷 469, 期 21, 页码 1958-1961出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physc.2009.07.003
关键词
FeSe; Iron-based superconductor; Superconductivity; Substituted effect
资金
- National Key Basic Research [2006CB601005, 2007CB925002]
- National Nature Science Foundation of China [10774146, 10774147]
- Director's Fund of Institute of Solid State Physics
- Director's Fund of Hefei Institutes of Physical Science
- Chinese Academy of Sciences, Hefei
The effect of the Ni-substitution on the superconductivity of alpha-FeSe0.82 system has been investigated. It is found that the superconductivity of alpha-FeSe0.82 can be quickly suppressed when a small quantity of Fe is Substituted by Ni element. The resistivity and moment of the sample at normal state increase with increasing Ni-substitution content. Moreover, it is found that the Ni-substitution does not change the structure transition temperature, but increases the spin density wave (SDW) order temperature. It is suggested that the quick suppression of superconductivity of alpha-FeSe0.82 caused by the Ni-substitution is related to the increase of SDW order temperature. Therefore, Fe atom plays a key role for the appearance of the superconductivity in FeSe system. (C) 2009 Elsevier B.V. All rights reserved.
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