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Common Origin of the Two Types of Magnetic Fluctuations in Iron Chalcogenides



Songxue Chi, Jose Rodriguez Rivera, Jeffrey W. Lynn, Chenglin Zhang, D. Phelan, Deepak Singh, Rick L. Paul, Pengcheng Dai


We use inelastic neutron scattering to study the low energy spin excitations in moderately doped non-superconducting Fe1.01Te0.72Se0.28. The spin excitations in this system contain components near (0.5,0,0) and (0.5, 0.5,0) in a-b plane reciprocal lattice units. At low energies the scattering is centered around (0.5,0.5,0). With increasing energy, the spectral weight of low energy spin excitations centere around (0.5,0,0) abruptly shifts around 2 meV to the incommensurate spin temperature dependence. These results indicate that the (0.5,0,0) type spin excitations and the incommensurate excitations around the (0.5,0.5,0) position have a common origin and both must be taken into account to understand the nature of magnetism and superconducting pairing in the iron chalcogenides.
Physical Review B


Iron Superconductors, Spin Excitations, Commensurate Excitations, Incommensurage Excitations, Inelastic neutron scattering


Chi, S. , Rodriguez Rivera, J. , Lynn, J. , Zhang, C. , Phelan, D. , Singh, D. , Paul, R. and Dai, P. (2011), Common Origin of the Two Types of Magnetic Fluctuations in Iron Chalcogenides, Physical Review B, [online], (Accessed February 25, 2024)
Created December 4, 2011, Updated October 12, 2021