Evidence of multiple nodeless energy gaps in superconducting Ba0.6K0.4Fe2As2 single crystals from scanning tunneling spectroscopy
Lei Shan, Yong-Lei Wang, Jing Gong, Bing Shen, Yan Huang, Huan Yang, Cong Ren, Hai-Hu Wen
DOI 10.1103/PhysRevB.83.060510 · Physical Review B
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Abstract
We report on low-temperature scanning tunneling microscopy and spectroscopy (STM) studies of the electronic structure of single-crystalline Ba0.6K0.4Fe2As2. Multiple superconducting gaps are observed in the density of states (DOS) and the sizes of the two dominant gaps ΔL and ΔS are 7.6 and 3.3 meV, respectively. The flat bottom of the DOS spectra near zero bias indicates the nodeless feature of the gaps, while the global fitting to the spectra definitely requires the anisotropy. The nodeless gaps with finite anisotropy revealed in our STM data agree well with the expectations of an extended s-wave superconductivity.
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. | 37.2 | Pressure not reported | onset |
| 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 |
| Fe(Se,Te) Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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