Pair-breaking effects and coherence peak in the terahertz conductivity of superconducting BaFe2−2xCo2xAs2 thin films
R. Valdés Aguilar, L. S. Bilbro, S. Lee, C. W. Bark, J. Jiang, J. D. Weiss, E. E. Hellstrom, D. C. Larbalestier, C. B. Eom, N. P. Armitage
DOI 10.1103/PhysRevB.82.180514 · Physical Review B
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Abstract
We report a study of high quality pnictide superconductor BaFe1.84Co0.16As2 epitaxial thin films using time-domain terahertz (THz) spectroscopy. Near Tc we find evidence for a coherence peak and qualitative agreement with the weak-coupling Mattis-Bardeen form of the conductivity. The real part of the THz conductivity is found to be not fully suppressed at low temperature and σ2 is significantly smaller than the Matthis-Bardeen expectation. The temperature dependence of the penetration depth λ follows a power law with an unusually high exponent of 3.1. We interpret these results as consistent with impurity scattering-induced pair breaking. Taken together our results are strong evidence for an extended s± order-parameter symmetry.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| BaFe1.84Co0.16As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 20.6 | Pressure not reported | unknown |
| BaFe1.84Co0.16As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 20.6 | Pressure not reported | unknown |
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