title: Control of tetrahedral coordination and superconductivity in FeSe0.5Te0.5 thin films.
abstract: 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.
authors.affiliation: Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, Maryland 21218, USA.
authors.forename: S X
authors.initials: SX
authors.lastname: Huang
authors.forename: C L
authors.initials: CL
authors.lastname: Chien
authors.forename: V
authors.initials: V
authors.lastname: Thampy
authors.forename: C
authors.initials: C
authors.lastname: Broholm