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

S. X. Huang, C. L. Chien, V. Thampy, C. Broholm

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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.

Original languageEnglish (US)
Article number217002
JournalPhysical Review Letters
Issue number21
StatePublished - May 25 2010
Externally publishedYes


ASJC Scopus subject areas

  • Physics and Astronomy(all)

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