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Neutron-scattering study of the oxypnictide superconductor LaFeAsO 0.87 F 0.13



Yiming Qiu, M. Kofu, Wei Bao, S.-H. Lee, Qingzhen Huang, Taner N. Yildirim, John R. Copley, Jeffrey Lynn, T. Wu, G. Wu, X. H. Chen


The recently discovered superconductor LaO0.87F0.13FeAs (TC≈26 K) was investigated using the neutron-scattering technique. No spin-density-wave (SDW) order was observed in the normal state or in the superconducting state, both with and without an applied magnetic field of 9 T, consistent with the proposal that SDW and superconductivity are competing in the laminar materials. While our inelastic measurements offer no constraint on the spin dynamic response from a d-wave pairing, an upper limit for the magnetic-resonance peak predicted from an extended s-wave pairing mechanism is provided. Our measurements also support the energy scale of the calculated phonon spectrum, which is used in the electron-phonon coupling theory and fails to produce the high observed TC.
Physical Review B


oxypnictide, high-Tc superconductor, neutron scattering


Qiu, Y. , Kofu, M. , Bao, W. , Lee, S. , Huang, Q. , Yildirim, T. , Copley, J. , Lynn, J. , Wu, T. , Wu, G. and Chen, X. (2008), Neutron-scattering study of the oxypnictide superconductor LaFeAsO 0.87 F 0.13, Physical Review B, [online],, (Accessed April 15, 2024)
Created August 26, 2008, Updated March 18, 2024