Control of tetrahedral coordination and superconductivity in FeSe0.5Te0.5 thin films.
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 (π, π) spin fluctuations promote superconductivity in Fe superconductors.
Huang
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Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, Maryland 21218, USA.
Chien
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Thampy
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Broholm
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