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Optical investigations of the normal and superconducting states reveal two electronic subsystems in iron pnictides

D. Wu, N. Barišić, P. Kallina, A. Faridian, B. Gorshunov, N. Drichko, L. J. Li, X. Lin, G. H. Cao, Z. A. Xu, N. L. Wang, and M. Dressel
Phys. Rev. B 81, 100512(R) – Published 25 March 2010

Abstract

Infrared reflectivity measurements on several 122 iron pnictides reveal the existence of two electronic subsystems. The one gapped due to the spin-density-wave transition in the parent materials, such as EuFe2As2, is responsible for superconductivity in the doped compounds, such as Ba(Fe0.92Co0.08)2As2 and Ba(Fe0.95Ni0.05)2As2. Analyzing the dc resistivity and scattering rate of this contribution, a hidden T2 dependence is found in the normal state. The second subsystem gives rise to incoherent background, present in all 122 compounds, which is basically temperature independent but affected by the superconducting transition.

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  • Received 22 February 2010

DOI:https://doi.org/10.1103/PhysRevB.81.100512

©2010 American Physical Society

Authors & Affiliations

D. Wu1,*, N. Barišić1,†, P. Kallina1, A. Faridian1, B. Gorshunov1, N. Drichko1, L. J. Li2, X. Lin2, G. H. Cao2, Z. A. Xu2, N. L. Wang3, and M. Dressel1

  • 11. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany
  • 2Department of Physics, Zhejiang University, Hangzhou 310027, People’s Republic of China
  • 3Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China

  • *dan.wu@pi1.physik.uni-stuttgart.de
  • barisic@pi1.physik.uni-stuttgart.de

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Issue

Vol. 81, Iss. 10 — 1 March 2010

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