Static and dynamical susceptibility of LaO1-xFxFeAs

M. Monni*, F. Bernardini, G. Profeta, A. Sanna, S. Sharma, J. K. Dewhurst, C. Bersier, A. Continenza, E. K.U. Gross, S. Massidda

*Corresponding author for this work

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6 Scopus citations

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 χ. 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 χ is the independent-electron susceptibility χ0. Using LaO1-xFxFeAs as a prototype material, in this report we present a detailed ab initio study of χ0 (q,ω) as a function of doping and of the internal atomic positions. The resulting static χ0 (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.

Original languageAmerican English
Article number104503
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume81
Issue number10
DOIs
StatePublished - 4 Mar 2010
Externally publishedYes

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