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Theory of Raman response of a superconductor with extended s-wave symmetry: Application to the iron pnictides

Andrey V. Chubukov, Ilya Eremin, and Maxim M. Korshunov
Phys. Rev. B 79, 220501(R) – Published 1 June 2009
Physics logo See Viewpoint: Shining light on iron pnictides with Raman scattering

Abstract

We argue that Raman study of Fe-pnictides is a way to unambiguously distinguish between various superconducting gaps proposed for these materials. We show that A1g Raman intensity develops a true resonance peak below 2Δ if the pairing gap has A1g symmetry in the folded Brillouin zone (Δ(k=0)=Δ,Δ(π,π)=Δ). No such peak develops for a pure s-wave gap, a d-wave gap, and an extended s-wave gap with Δ(k)=Δcoskx2cosky2. We show that the peak remains quite strong for the values of interpocket impurity scattering used to fit NMR data.

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  • Received 14 January 2009

DOI:https://doi.org/10.1103/PhysRevB.79.220501

©2009 American Physical Society

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Shining light on iron pnictides with Raman scattering

Published 1 June 2009

Calculations of the Raman response for iron pnictide superconductors reveal a collective mode that may be crucial to unravel the pairing symmetry.

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Authors & Affiliations

Andrey V. Chubukov1, Ilya Eremin2,3,*, and Maxim M. Korshunov2,4

  • 1Department of Physics, University of Wisconsin–Madison, Madison, Wisconsin 53706, USA
  • 2Max-Planck-Institut für Physik komplexer Systeme, D-01187 Dresden, Germany
  • 3Institute für Mathematische und Theoretische Physik, TU Braunschweig, D-38106 Braunschweig, Germany
  • 4L. V. Kirensky Institute of Physics, Siberian Branch of Russian Academy of Sciences, 660036 Krasnoyarsk, Russia

  • *Also at Physics Department, Kazan State University, 420008 Kazan, Russian Federation.

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Issue

Vol. 79, Iss. 22 — 1 June 2009

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