Low work function in the 122-family of iron-based superconductors

H. Pfau, H. Soifer, J. A. Sobota +8

We determine the work functions of the iron arsenic compounds $A$Fe${}_2$As${}_2$ ($A=\mathrm{Ca},\mathrm{Ba},\mathrm{Cs}$) using photoemission spectroscopy to be 2.7 eV for CaFe${}_2$As${}_2$, 1.8 eV for…