Static and Dynamical Susceptibility of LaO1-xFxFeAs

Abstract

The mechanism of superconductivity and magnetism and their possible interplay have recently been under debate in pnictides. A likely pairing mechanism includes an important role of spin fluctuations and can be expressed in terms of the magnetic susceptibility chi. The latter is therefore a key quantity in the determination of both the magnetic properties of the system in the normal state, and of the contribution of spin fluctuations to the pairing potential. A basic ingredient to obtain chi is the independent-electron susceptibility chi0. Using LaO1-xFxFeAs as a prototype material, in this report we present a detailed ab-initio study of chi0(q,omega), as a function of doping and of the internal atomic positions. The resulting static chi0(q,0) is consistent with both the observed M-point related magnetic stripe phase in the parent compound, and with the existence of incommensurate magnetic structures predicted by ab-initio calculations upon doping.

15 pages, 8 figures

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Cited by in corpus (3)

• The Puzzle of High Temperature Superconductivity in Layered Iron Pnictides and Chalcogenides
• Accurate bare susceptibilities from full-potential $\text{ab initio}$ calculations
• Theoretical Investigation of Optical Conductivity in Ba [Fe(1-x)Co(x)]2 As2