| Autor: |
Pfau, H., Soifer, H., Sobota, J. A., Gauthier, A., Rotundu, C. R., Palmstrom, J. C., Fisher, I. R., Chen, G. -Y., Wen, H. -H., Shen, Z. -X., Kirchmann, P. S. |
| Rok vydání: |
2020 |
| Předmět: |
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| Zdroj: |
Phys. Rev. Materials 4, 034801 (2020) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1103/PhysRevMaterials.4.034801 |
| Popis: |
We determine the work functions of the iron arsenic compounds $A$Fe$_2$As$_2$ ($A=\mathrm{Ca, Ba, Cs}$) using photoemission spectroscopy to be 2.7 eV for CaFe$_2$As$_2$, 1.8 eV for BaFe$_2$As$_2$, and 1.3 eV for CsFe$_2$As$_2$. The work functions of these 122 iron-based superconductors track those of the elementary metal $A$ but are substantially smaller. The most likely explanation of this observation is that the cleaving surface exposes only half an $A$-layer. The low work function and good photoemission cross section of BaFe$_2$As$_2$ and CsFe$_2$As$_2$ enable photoemission even from a common white LED light. |
| Databáze: |
arXiv |
| Externí odkaz: |
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