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Optical signature of sub-gap absorption in the superconducting state of Ba(Fe,Co)2As2 | | R. P. S. M. Lobo
; Y. M. Dai
; U. Nagel
; T. Room
; J. P. Carbotte
; T. Timusk
; A. Forget
; D. Colson
; | | Date: |
21 Jul 2010 | | Abstract: | The optical conductivity of Ba(Fe$_{0.92}$Co$_{0.08}$)$_2$As$_2$ shows a
clear signature of the superconducting gap, but a simple $s$-wave description
fails in accounting for the low frequency response. This task is achieved by
introducing an extra Drude peak in the superconducting state representing
sub-gap absorption, other than thermally broken pairs. This extra peak and the
coexisting $s$-wave response respect the total sum rule indicating a common
origin for the carriers. We discuss the possible origins for this absorption as
(i) quasiparticles due to pair-breaking from interband impurity scattering in a
two band $s_{pm}$ gap symmetry model, which includes (ii) the possible
existence of impurity levels within an isotropic gap model; or (iii) an
indication that one of the bands is highly anisotropic. | | Source: | arXiv, 1007.3761 | | Services: | Forum | Review | PDF | Favorites | |
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