Chalcogen-height dependent magnetic interactions and magnetic order switching in FeSexTe1-x

Chang Youn Moon, Hyoung Joon Choi

Research output: Contribution to journalArticlepeer-review

132 Citations (Scopus)


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 (π, 0) magnetic ordering, the single-stripe (π, π) 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.

Original languageEnglish
Article number057003
JournalPhysical review letters
Issue number5
Publication statusPublished - 2010 Feb 3

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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