Orbital selectivity of layer-resolved tunneling in the iron-based superconductor Ba0.6K0.4Fe2As2
| Autor: | C. S. Ting, Ziqiang Wang, Jiaxin Yin, Jian Li, Zheng Wu, Chenglin Zhang, Xianxin Wu, Xiongjun Wang, Jiuning Hu, X. J. Liang, J. H. Wang, Pengcheng Dai, Hong Ding, Shuheng H. Pan, G. F. Chen, Pei-Herng Hor, Chiming Jin, Ang Li |
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| Rok vydání: | 2020 |
| Předmět: |
Superconductivity
Materials science Condensed matter physics 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences law.invention Iron-based superconductor Atomic orbital law Condensed Matter::Superconductivity Pairing 0103 physical sciences Scanning tunneling microscope 010306 general physics 0210 nano-technology Spectroscopy Pnictogen Quantum tunnelling |
| Zdroj: | Physical Review B. 102 |
| ISSN: | 2469-9969 2469-9950 |
| Popis: | We use scanning tunneling microscopy/spectroscopy to elucidate the Cooper pairing of the iron pnictide superconductor ${\mathrm{Ba}}_{0.6}{\mathrm{K}}_{0.4}{\mathrm{Fe}}_{2}{\mathrm{As}}_{2}$. By a cold-cleaving technique, we obtain atomically resolved termination surfaces with different layer identities. Remarkably, we observe that the low-energy tunneling spectrum related to superconductivity has an unprecedented dependence on the layer identity. By cross referencing with the angle-revolved photoemission results and the tunneling data of LiFeAs, we find that tunneling on each termination surface probes superconductivity through selecting distinct $\mathrm{Fe}\text{\ensuremath{-}}3d$ orbitals. These findings imply the real-space orbital features of the Cooper pairing in the iron pnictide superconductors, and propose a general concept that, for complex multiorbital material, tunneling on different terminating layers can feature orbital selectivity. |
| Databáze: | OpenAIRE |
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