Optical signature of subgap absorption in the superconducting state of Ba(Fe1−xCox)2As2
R. P. S. M. Lobo, Y. M. Dai, U. Nagel, T. Rõõm, J. P. Carbotte, T. Timusk, A. Forget, D. Colson
DOI 10.1103/PhysRevB.82.100506 · Physical Review B
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Abstract
The optical conductivity of Ba(Fe0.92Co0.08)2As2 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 subgap 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±-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-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba(Fe0.92Co0.08)2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 22.5 | Pressure not reported | unknown |
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