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Phys. Rev. B 79, 220501(R) (2009) [4 pages]

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

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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

Received 14 January 2009; published 1 June 2009

See accompanying Physics Viewpoint

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)=Δ coskx/2cosky/2. We show that the peak remains quite strong for the values of interpocket impurity scattering used to fit NMR data.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.79.220501
DOI:
10.1103/PhysRevB.79.220501
PACS:
74.20.Mn, 74.20.Rp, 74.25.Jb, 74.25.Gz

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

 
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