Spin waves in the (π,0) magnetically ordered iron chalcogenide Fe1.05Te
We use neutron scattering to show that spin waves in the iron chalcogenide Fe(1.05)Te display novel dispersion clearly different from both the first principles density functional calculations and recent observations in the related iron pnictide CaFe(2)As(2). By fitting to a Heisenberg Hamiltonian, w...
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Published in | Physical review letters Vol. 106; no. 5; p. 057004 |
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Main Authors | , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
United States
04.02.2011
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Online Access | Get more information |
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Summary: | We use neutron scattering to show that spin waves in the iron chalcogenide Fe(1.05)Te display novel dispersion clearly different from both the first principles density functional calculations and recent observations in the related iron pnictide CaFe(2)As(2). By fitting to a Heisenberg Hamiltonian, we find that although the nearest-neighbor exchange couplings in the two systems are quite different, their next-nearest-neighbor (NNN) couplings are similar. This suggests that superconductivity in the pnictides and chalcogenides share a common magnetic origin that is intimately associated with the NNN magnetic coupling between the irons. |
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ISSN: | 1079-7114 |
DOI: | 10.1103/PhysRevLett.106.057004 |