Neutron-scattering study of the oxypnictide superconductor LaFeAsO0.87F0.13

Y. Qiu; M. Kofu; Wei Bao; S.-H. Lee; Q. Huang; T. Yildirim; J. R. D. Copley; J. W. Lynn; T. Wu; G. Wu; X. H. Chen

doi:10.1103/PhysRevB.78.052508

Neutron-scattering study of the oxypnictide superconductor LaFeAsO_0.87F_0.13

Y. Qiu, M. Kofu, Wei Bao^*, S.-H. Lee, Q. Huang, T. Yildirim, J. R. D. Copley, J. W. Lynn, T. Wu, G. Wu, X. H. Chen

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

48 Citations (Scopus)

Abstract

The recently discovered superconductor LaO_0.87F_0.13FeAs (T_C≈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 T_C.

Original language	English
Article number	052508
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	78
Issue number	5
Online published	26 Aug 2008
DOIs	https://doi.org/10.1103/PhysRevB.78.052508
Publication status	Published - Aug 2008
Externally published	Yes

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@article{51a163c05d6a4dad963e961b7b9fe749,

title = "Neutron-scattering study of the oxypnictide superconductor LaFeAsO0.87F0.13",

abstract = "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.",

author = "Y. Qiu and M. Kofu and Wei Bao and S.-H. Lee and Q. Huang and T. Yildirim and Copley, {J. R. D.} and Lynn, {J. W.} and T. Wu and G. Wu and Chen, {X. H.}",

year = "2008",

month = aug,

doi = "10.1103/PhysRevB.78.052508",

language = "English",

volume = "78",

journal = "Physical Review B - Condensed Matter and Materials Physics",

issn = "1098-0121",

publisher = "American Physical Society",

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TY - JOUR

T1 - Neutron-scattering study of the oxypnictide superconductor LaFeAsO0.87F0.13

AU - Qiu, Y.

AU - Kofu, M.

AU - Bao, Wei

AU - Lee, S.-H.

AU - Huang, Q.

AU - Yildirim, T.

AU - Copley, J. R. D.

AU - Lynn, J. W.

AU - Wu, T.

AU - Wu, G.

AU - Chen, X. H.

PY - 2008/8

Y1 - 2008/8

N2 - 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.

AB - 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.

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U2 - 10.1103/PhysRevB.78.052508

DO - 10.1103/PhysRevB.78.052508

M3 - RGC 21 - Publication in refereed journal

SN - 1098-0121

VL - 78

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

IS - 5

M1 - 052508

ER -