@article{b807d7bcbc9b43b988f25f74559a994f,
title = "Neutron scattering measurements of spatially anisotropic magnetic exchange interactions in semiconducting K0.85Fe1.54Se2 (TN=280 K)",
abstract = "We use neutron scattering to study the spin excitations associated with the stripe antiferromagnetic order in semiconducting K0.85Fe1.54Se2 (TN=280K). We show that the spin-wave spectra can be accurately described by an effective Heisenberg Hamiltonian with highly anisotropic inplane couplings at T=5K. At high temperature (T=300K) above TN, short-range magnetic correlation with anisotropic correlation lengths are observed. Our results suggest that, despite the dramatic difference in the Fermi surface topology, the inplane anisotropic magnetic couplings are a fundamental property of the iron-based compounds; this implies that their antiferromagnetism may originate from local strong correlation effects rather than weak coupling Fermi surface nesting.",
author = "Jun Zhao and Yao Shen and Birgeneau, {R. J.} and Miao Gao and Lu, {Zhong Yi} and Lee, {D. H.} and Lu, {X. Z.} and Xiang, {H. J.} and Abernathy, {D. L.} and Y. Zhao",
year = "2014",
month = apr,
day = "30",
doi = "10.1103/PhysRevLett.112.177002",
language = "English",
volume = "112",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "17",
}