Journal
PHYSICAL REVIEW LETTERS
Volume 112, Issue 17, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.112.177002
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Funding
- Fudan University
- NSFC [11374059, 11190024, 91121008]
- Office of Science, Office of Basic Energy Sciences, U.S. Department of Energy [DE-AC02-05CH11231, DE-AC03-76SF008]
- Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy
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We use neutron scattering to study the spin excitations associated with the stripe antiferromagnetic order in semiconducting K0.85Fe1.54Se2 (T-N = 280 K). We show that the spin-wave spectra can be accurately described by an effective Heisenberg Hamiltonian with highly anisotropic inplane couplings at T = 5 K. At high temperature (T = 300 K) 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.
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