Probing the Superconducting Energy Gap from Infrared Spectroscopy on a Ba0.6K0.4Fe2As2 Single Crystal with Tc=37 K
G. Li, W. Z. Hu, J. Dong, Z. Li, P. Zheng, G. F. Chen, J. L. Luo, N. L. Wang
DOI 10.1103/PhysRevLett.101.107004 · Physical Review Letters
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Abstract
We performed optical spectroscopy measurement on a superconducting Ba0.6K0.4Fe2As2 single crystal with Tc=37 K. Formation of the superconducting energy gaps in the far-infrared reflectance spectra below Tc is clearly observed. A flat and close to unity reflectance is observed roughly below 150 cm−1 for T≪Tc, following an s-wave pairing line shape. A more rapid decrease occurs near 200 cm−1, leading to a peak in the ratio of the reflectance at T≪Tc over that for T≥Tc. We determined the absolute value of the penetration depth at 10 K as λ≃2000±80 Å. A spectral weight analysis shows that the Ferrell-Glover-Tinkham sum rule is satisfied at low energy scale, less than 6Δ.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba0.6K0.4Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 37 | Pressure not reported | unknown |
| Ba0.6K0.4Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 37 | Pressure not reported | unknown |
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