TY - JOUR
T1 - Static and dynamical susceptibility of LaO1-xFxFeAs
AU - Monni, M.
AU - Bernardini, F.
AU - Profeta, G.
AU - Sanna, A.
AU - Sharma, S.
AU - Dewhurst, J. K.
AU - Bersier, C.
AU - Continenza, A.
AU - Gross, E. K.U.
AU - Massidda, S.
PY - 2010/3/4
Y1 - 2010/3/4
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=77954918344&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.81.104503
DO - 10.1103/PhysRevB.81.104503
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AN - SCOPUS:77954918344
SN - 1098-0121
VL - 81
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 10
M1 - 104503
ER -