Highly anisotropic energy gap in superconducting Ba(Fe0.9Co0.1)2As2 from optical conductivity measurements
T. Fischer, A. V. Pronin, J. Wosnitza, K. Iida, F. Kurth, S. Haindl, L. Schultz, B. Holzapfel, E. Schachinger
DOI 10.1103/PhysRevB.82.224507 · Physical Review B
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Abstract
We have measured the complex dynamical conductivity, σ=σ1+iσ2, of superconducting Ba(Fe0.9Co0.1)2As2 (Tc=22 K) at terahertz frequencies and temperatures 2–30 K. In the frequency dependence of σ1 below Tc, we observe clear signatures of the superconducting energy gap opening. The temperature dependence of σ1 demonstrates a pronounced coherence peak at frequencies below 15 cm−1 (1.8 meV). The temperature dependence of the penetration depth, calculated from σ2, shows power-law behavior at the lowest temperatures. Analysis of the conductivity data with a two-gap model, gives the smaller isotropic s-wave gap of ΔA=3 meV, while the larger gap is highly anisotropic with possible nodes and its rms amplitude is Δ0=8 meV. Overall, our results are consistent with a two-band superconductor with an s± gap symmetry.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba(Fe0.9Co0.1)2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 22 | Pressure not reported | midpoint |
| Ba(Fe0.9Co0.1)2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 25 | Pressure not reported | onset |
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