Universality of dispersive spin-resonance mode in superconducting BaFe2As2

C. H. Lee; P. Steffens; N. Qureshi; M. Nakajima; K. Kihou; A. Iyo; H. Eisaki; M. Braden

doi:10.1103/PhysRevLett.111.167002

Universality of dispersive spin-resonance mode in superconducting BaFe2As2

Superconductivity 2013-11-06 v1

Authors: C. H. Lee , P. Steffens , N. Qureshi , M. Nakajima , K. Kihou , A. Iyo , H. Eisaki , M. Braden

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Abstract

Spin fluctuations in superconducting BaFe2(As1-xPx)2 (x=0.34, Tc = 29.5 K) are studied using inelastic neutron scattering. Well-defined commensurate magnetic signals are observed at ({\pi},0), which is consistent with the nesting vector of the Fermi surface. Antiferromagnetic (AFM) spin fluctuations in the normal state exhibit a three-dimensional character reminiscent of the AFM order in nondoped BaFe2As2. A clear spin gap is observed in the superconducting phase forming a peak whose energy is significantly dispersed along the c-axis. The bandwidth of dispersion becomes larger with approaching the AFM ordered phase universally in all superconducting BaFe2As2, indicating that the dispersive feature is attributed to three-dimensional AFM correlations. The results suggest a strong relationship between the magnetism and superconductivity.

Keywords

spin fluctuations inelastic neutron scattering spin resonance mode superconductivity BaFe2As2 antiferromagnetic correlations spin gap

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@article{arxiv.1309.4197,
  title  = {Universality of dispersive spin-resonance mode in superconducting BaFe2As2},
  author = {C. H. Lee and P. Steffens and N. Qureshi and M. Nakajima and K. Kihou and A. Iyo and H. Eisaki and M. Braden},
  journal= {arXiv preprint arXiv:1309.4197},
  year   = {2013}
}

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5 pages, 5 figures

Universality of dispersive spin-resonance mode in superconducting BaFe2As2

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