Static and Dynamical Susceptibility of LaO1-xFxFeAs

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 quant...

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Bibliographic Details
Published in:arXiv.org 2010-01
Main Authors: Monni, M, Bernardini, F, Profeta, G, Sanna, A, Sharma, S, Dewhurst, J K, Bersier, C, Continenza, A, Gross, E K U, Massidda, S
Format: Article
Language:English
Subjects:
Doping
Group 5A compounds
Magnetic permeability
Magnetic properties
Magnetism
Superconductivity
Variations
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Summary: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.
ISSN:2331-8422
DOI:10.48550/arxiv.1001.5154