| Autor: |
Millo, Oded, Asulin, Itay, Yuli, Ofer, Felner, Israel, Ren, Zhi-An, Shen, Xiao-Li, Che, Guang-Can, Zhao, Zhong-Xian |
| Rok vydání: |
2008 |
| Předmět: |
|
| Zdroj: |
Phys. Rev. B 78, 092505 (2008) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1103/PhysRevB.78.092505 |
| Popis: |
We report a scanning tunneling spectroscopy investigation of polycrystalline SmFeAsO0.85 having a superconducting transition at 52 K. On large regions of the sample surface the tunneling spectra exhibited V-shaped gap structures with no coherence peaks, indicating degraded surface properties. In some regions, however, the coherence peaks were clearly observed, and the V-shaped gaps could be fit to the theory of tunneling into a d-wave superconductor, yielding gap values between 8 to 8.5 meV, corresponding to the ratio 2D/KTc ~ 3.55 - 3.8, which is slightly above the BCS weak-coupling prediction. In other regions the spectra exhibited zero-bias conductance peaks, consistent with a d-wave order parameter symmetry. |
| Databáze: |
arXiv |
| Externí odkaz: |
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