Control of Tetrahedral Coordination and Superconductivity in FeSe0.5Te0.5 Thin Films

被引：72
|
作者：
Huang, S. X. [1 ]
Chien, C. L. [1 ]
Thampy, V. [1 ,2 ]
Broholm, C. [1 ,2 ,3 ]
机构：
[1] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA
[2] Johns Hopkins Univ, Inst Quantum Matter, Baltimore, MD 21218 USA
[3] Natl Inst Stand & Technol, NIST Ctr Neutron Res, Gaithersburg, MD 20899 USA
来源：
PHYSICAL REVIEW LETTERS | 2010年 / 104卷 / 21期
关键词：
D O I：
10.1103/PhysRevLett.104.217002
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We demonstrate a close relationship between superconductivity and the dimensions of the Fe-Se(Te) tetrahedron in FeSe0.5Te0.5. This is done by exploiting thin film epitaxy, which provides controlled biaxial stress, both compressive and tensile, to distort the tetrahedron. The Se/Te height within the tetrahedron is found to be of crucial importance to superconductivity, in agreement with the scenario that (pi, pi) spin fluctuations promote superconductivity in Fe superconductors.
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页数：4
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