Spin waves in the $(π,0)$ magnetically ordered iron chalcogenide Fe$_{1.05}$Te

Details Spin waves in the $(π,0)$ magnetically ordered iron chalcogenide Fe$_{1.05}$Te Spin waves in the $(π,0)$ magnetically ordered iron chalcogenide Fe$_{1.05}$Te

2010-11-12

arxiv.org/abs/1011.2930v2

Phys. Rev. Lett. 106, 057004 (2011)

Physics

Condensed Matter

Superconductivity

Includes supplementary information as appendices

Scientific paper

10.1103/PhysRevLett.106.057004

We use inelastic neutron scattering to show that the spin waves in the iron chalcogenide Fe$_{1.05}$Te display novel dispersion clearly different from those in the related iron pnictide systems. By fitting the spin waves to a Heisenberg Hamiltonian, we extract magnetic exchange couplings that are dramatically different from both predictions by density functional calculations and measurements on the iron pnictide CaFe$_2$As$_2$. While the nearest-neighbor exchange couplings in CaFe$_2$As$_2$ and Fe$_{1.05}$Te are quite different, their next-nearest-neighbor exchange couplings are similar. These results suggest that superconductivity in the pnictides and chalcogenides share a common magnetic origin that is intimately associated with the next-nearest-neighbor magnetic coupling between the irons.

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