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Doping dependence of spin fluctuations and electron correlations in iron pnictides
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SYSNO ASEP 0352183 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Doping dependence of spin fluctuations and electron correlations in iron pnictides Author(s) Ikeda, H. (JP)
Arita, R. (JP)
Kuneš, Jan (FZU-D) RID, ORCID, SAISource Title Physical Review. B - ISSN 1098-0121
Roč. 82, č. 2 (2010), 024508/1-024508/6Number of pages 6 s. Language eng - English Country US - United States Keywords iron pnicitdes ; dynamic spin susceptibility ; fluctuation-exchange approximation Subject RIV BM - Solid Matter Physics ; Magnetism CEZ AV0Z10100521 - FZU-D (2005-2011) UT WOS 000279887300005 DOI 10.1103/PhysRevB.82.024508 Annotation Doping dependence of the spin fluctuations and the electron correlations in the effective five-band Hubbard model for iron pnictides is investigated using the fluctuation-exchange approximation. For a moderate hole doping, we find a dominant low-energy spin excitation at Q=(Π,0) which becomes critical at low temperature. The low-energy spin excitations in the heavily hole-doped region are characterized by weak Q dependence. The electron doping leads to an appearance of a pseudogap in spin-excitation spectrum. Correspondingly, the NMR-1/T1 relaxation rate is strongly enhanced on the hole-doped side and suppressed on the electron-doped side of the phase diagram. This behavior can be to large extent understood by systematic changes of the Fermi-surface topology. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2011
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