Control of tetrahedral coordination and superconductivity in FeSe0.5Te0.5 thin films

Details Control of tetrahedral coordination and superconductivity in FeSe0.5Te0.5 thin films Control of tetrahedral coordination and superconductivity in FeSe0.5Te0.5 thin films

2010-02-13

arxiv.org/abs/1002.2669v1

Phys. Rev. Lett. 104, 217002 (2010)

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevLett.104.217002

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 theoretical proposal that (pi,pi) spin fluctuations promote superconductivity in Fe superconductors.

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