title: Chalcogen-height dependent magnetic interactions and magnetic order switching in FeSexTe1-x.
abstract: Magnetic properties of iron chalcogenide superconducting materials are investigated using density-functional calculations. We find that the stability of magnetic phases is very sensitive to the height of chalcogen species from the Fe plane: while FeTe with optimized Te height has the double-stripe (pi, 0) magnetic ordering, the single-stripe (pi, pi) ordering becomes the ground state when Te is lowered below a critical height by, e.g., Se doping. This behavior is understood by opposite Te-height dependences of the superexchange interaction and a longer range magnetic interaction mediated by itinerant electrons. We also demonstrate a linear temperature dependence of the macroscopic magnetic susceptibility in the single-stripe phase in contrast with the constant behavior in the double-stripe phase. Our findings provide a comprehensive and unified view on the magnetism in FeSexTe1-x and iron pnictide superconductors.
authors.affiliation: Department of Physics and IPAP, Yonsei University, Seoul 120-749, Korea.
authors.forename: Chang-Youn
authors.initials: CY
authors.lastname: Moon
authors.forename: Hyoung Joon
authors.initials: HJ
authors.lastname: Choi