Static and Dynamical Susceptibility of LaO1-xFxFeAs
| Autor: | Monni, M., Bernardini, F., Profeta, G., Sanna, A., Sharma, S., Dewhurst, J. K., Bersier, C., Continenza, A., Gross, E. K. U., Massidda, S. |
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| Rok vydání: | 2010 |
| Předmět: | |
| Zdroj: | Phys. Rev. B 81, 104503 (2010) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.81.104503 |
| Popis: | 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. Comment: 15 pages, 8 figures |
| Databáze: | arXiv |
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