Neutron scattering resonance and the iron-pnictide superconducting gap

T. A. Maier, S. Graser, D. J. Scalapino, and P. Hirschfeld
Phys. Rev. B 79, 134520 – Published 22 April 2009

Abstract

The existence of a neutron scattering resonance at a wave vector q implies a sign change of the gap between two Fermi-surface regions separated by wave vector q. For the Fe pnictides, a resonance has been observed for a wave vector q which connects a hole Fermi surface around the Γ point with an electron Fermi surface around the X or Y points of the 1 Fe/unit cell Brillouin zone. Here we study the neutron scattering resonance for a five-orbital model within a random-phase approximation—BCS approximation. Our results show that both an isotropic sign-switched and an anisotropic extended s-wave gap are consistent with the present data for q near (π,0) and that scattering at other momentum transfers can be useful in distinguishing between gap structures.

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  • Received 27 February 2009

DOI:https://doi.org/10.1103/PhysRevB.79.134520

©2009 American Physical Society

Authors & Affiliations

T. A. Maier1,2,*, S. Graser3,†, D. J. Scalapino4,‡, and P. Hirschfeld5,§

  • 1Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6164, USA
  • 2Computer Science and Mathematics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6494, USA
  • 3Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, D-86135 Augsburg, Germany
  • 4Department of Physics, University of California, Santa Barbara, California 93106-9530, USA
  • 5Department of Physics, University of Florida, Gainesville, Florida 32611, USA

  • *maierta@ornl.gov
  • graser@phys.ufl.edu
  • djs@physics.ucsb.edu
  • §pjh@phys.ufl.edu

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Issue

Vol. 79, Iss. 13 — 1 April 2009

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