Common origin of the two types of magnetic fluctuations in iron chalcogenides

Abstract

We use inelastic neutron scattering to study the low energy spin excitations in moderately doped non-superconducting Fe${}_{1.01}$Te${}_{0.72}$Se${}_{0.28}$. 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 using tetragonal unit cell notation (a=b=3.772 Åand c=6.061 Å). At low energies the scattering is centered around (0.5,0,0). With increasing energy, the spectral weight of low energy spin excitations centered around (0.5,0,0) abruptly shifts around 3 meV to the incommensurate spin excitations centered around (0.5,0.5,0). However both types of spin fluctuations exhibit the identical 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.

7 pages 7 figures

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• Soft striped magnetic fluctuations competing with superconductivity in Fe_{1+x}Te
• Spin fluctuations and superconductivity in powders of Fe_1+xTe_0.7Se_0.3 as a function of interstitial iron concentration
• Bicollinear Antiferromagnetic Order, Monoclinic Distortion, and Reversed Resistivity Anisotropy in FeTe as a Result of Spin-Lattice Coupling
• Competing spin density wave, collinear, and helical magnetism in Fe1+xTe
• First-Principle Wannier function analysis of the electronic structure of PdTe: Weaker magnetism and superconductivity
• Temperature dependence of the resonance and low energy spin excitations in superconducting FeTe${}_{0.6}$Se${}_{0.4}$