Low work function in the 122-family of iron-based superconductors
| Autor: | Johanna C. Palmstrom, Zhi-Xun Shen, G.-Y. Chen, Haidan Wen, Alexandre Gauthier, Ian R. Fisher, Hadas Soifer, Heike Pfau, Costel R. Rotundu, Jonathan Sobota, Patrick S. Kirchmann |
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| Rok vydání: | 2020 |
| Předmět: |
Superconductivity
Materials science Strongly Correlated Electrons (cond-mat.str-el) Physics and Astronomy (miscellaneous) Photoemission spectroscopy Condensed Matter - Superconductivity FOS: Physical sciences Low work function 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Superconductivity (cond-mat.supr-con) Condensed Matter - Strongly Correlated Electrons Crystallography Iron based 0103 physical sciences General Materials Science 010306 general physics 0210 nano-technology |
| Zdroj: | Physical Review Materials. 4 |
| ISSN: | 2475-9953 |
| Popis: | We determine the work functions of the iron arsenic compounds $A{\mathrm{Fe}}_{2}{\mathrm{As}}_{2}$ ($A=\mathrm{Ca},\mathrm{Ba},\mathrm{Cs}$) using photoemission spectroscopy to be 2.7 eV for ${\mathrm{CaFe}}_{2}{\mathrm{As}}_{2}$, 1.8 eV for ${\mathrm{BaFe}}_{2}{\mathrm{As}}_{2}$, and 1.3 eV for ${\mathrm{CsFe}}_{2}{\mathrm{As}}_{2}$. 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 ${\mathrm{BaFe}}_{2}{\mathrm{As}}_{2}$ and ${\mathrm{CsFe}}_{2}{\mathrm{As}}_{2}$ enable photoemission even from a common white LED light. |
| Databáze: | OpenAIRE |
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