Volume 104, Number 4, November 2013
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||12 December 2013|
Optical conductivity of Ba0.6K0.4Fe2As2: The effect of in-plane and out-of-plane doping in the superconducting gap
1 LPEM, ESPCI- ParisTech, CNRS, UPMC - 10 rue Vauquelin, F-75231 Paris Cedex 5, France
2 Beijing National Laboratory for Condensed Matter Physics, National Laboratory for Superconductivity, Institute of Physics, Chinese Academy of Sciences - P.O. Box 603, Beijing 100190, China
3 National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University Nanjing 210093, China
Received: 20 September 2013
Accepted: 17 November 2013
We measured the in-plane optical conductivity of a nearly optimally doped single crystal of Ba0.6K0.4Fe2As2. Upon entering the superconducting state the optical conductivity vanishes below , indicating a fully gapped system. A quantitative modeling of the optical response of this material requires two different isotropic gaps, the larger of which dominates the London penetration depth. The temperature dependence of these gaps indicate a strong interband interaction, but no impurity-scattering–induced pair breaking is present. This contrasts to the large residual conductivity observed in optimally doped BaFe1.84Co0.08As2 and strongly supports an gap symmetry for both compounds.
PACS: 74.20.Rp – Pairing symmetries (other than s-wave) / 74.70.Xa – Pnictides and chalcogenides / 74.25.Gz – Optical properties
© EPLA, 2013
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