Q-scan analysis of the neutron scattering in iron-based superconductors

Yuki Nagai and Kazuhiko Kuroki
Phys. Rev. B 85, 134521 – Published 19 April 2012

Abstract

We propose a way to determine the pairing state of the iron pnictide superconductors exploiting the momentum (Q) scan of the neutron scattering data. We investigate the spin susceptibility in the s± and s++ superconducting states for various doping levels using the effective five-orbital model and considering the quasiparticle damping. The peak position of the intensity shifts from the position on the line Qx=π to that on the line Qy=0 as the doping level is decreased from electron doping to hole doping. We find that the Q dependence of the ratio of the intensity in the superconducting state to that in the normal state is qualitatively different between the s±-wave and s++-wave pairings. We propose to investigate experimentally this ratio in Q space to distinguish the two pairing states.

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  • Received 11 January 2012

DOI:https://doi.org/10.1103/PhysRevB.85.134521

©2012 American Physical Society

Authors & Affiliations

Yuki Nagai1,2,3 and Kazuhiko Kuroki3,4

  • 1CCSE, Japan Atomic Energy Agency, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8587, Japan
  • 2CREST (JST), 4-1-8 Honcho, Kawaguchi, Saitama, 332-0012, Japan
  • 3TRIP (JST), Chiyoda, Tokyo 102-0075, Japan
  • 4Department of Applied Physics and Chemistry, The University of Electro-Communications, Chofu, Tokyo 182-8585, Japan

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Issue

Vol. 85, Iss. 13 — 1 April 2012

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