Universality of the Dispersive Spin-Resonance Mode in Superconducting BaFe2As2

C. H. Lee, P. Steffens, N. Qureshi, M. Nakajima, K. Kihou, A. Iyo, H. Eisaki, and M. Braden
Phys. Rev. Lett. 111, 167002 – Published 16 October 2013

Abstract

Spin fluctuations in superconducting BaFe2(As1xPx)2 (x=0.34, Tc=29.5K) are studied using inelastic neutron scattering. Well-defined commensurate magnetic signals are observed at (π, 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.

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  • Received 19 June 2013

DOI:https://doi.org/10.1103/PhysRevLett.111.167002

© 2013 American Physical Society

Authors & Affiliations

C. H. Lee1,2, P. Steffens3, N. Qureshi4, M. Nakajima1,2, K. Kihou1,2, A. Iyo1,2, H. Eisaki1,2, and M. Braden4

  • 1National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan
  • 2Transformative Research-Project on Iron Pnictides (TRIP), JST, Chiyoda, Tokyo 102-0075, Japan
  • 3Institut Laue Langevin, 6 Rue Jules Horowitz BP 156, F-38042 Grenoble Cedex 9, France
  • 4II. Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany

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Vol. 111, Iss. 16 — 18 October 2013

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