Disorder-Sensitive Superconductivity and Bonding Network in the Iron-Silicide Superconductor Lu2Fe3Si5

被引：0
|
作者：
Okuyama, H. [1 ]
Takase, K. [1 ]
Takano, Y. [1 ]
Watanabe, T. [1 ]
Yoshida, F. [2 ]
Moriyoshi, C. [2 ]
Kuroiwa, Y. [2 ]
机构：
[1] Nihon Univ, CST, Dept Phys, Chiyoda Ku, Tokyo 1018308, Japan
[2] Hiroshima Univ, Dept Phys Sci, Grad Sch Sci, Hiroshima 7398526, Japan
来源：
SOLID COMPOUNDS OF TRANSITION ELEMENTS | 2011年 / 170卷
关键词：
Iron-based compound; Superconductivity; Bonding nature; Substitution effect;
D O I：
10.4028/www.scientific.net/SSP.170.118
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We performed experimentally the electron-density mapping on the crystal structure of the iron-based superconductor Lu2Fe3Si5 which revealed the Fe-Si covalent-bonding network with the fully ionized Lu-sites. And, for Lu2Fe3Si5, we investigated the effect of Fe- and Si-site substitutions on the superconductivity. The Fe-site-substitution study revealed that, in addition to the disorder-sensitive superconductivity, the additionally-provided 3d electrons or holes tend to be itinerant rather than localized. Taking into account that the localized magnetic moments introduced on the Lu-sites are inactive as magnetic pair breakers, the present results suggest that, in Lu2Fe3Si5, the Fe-Si bonding network should be the playground for the exotic superconductivity which is characterized by the sign-reversed superconducting gap function.
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页码：118 / 121
页数：4
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