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

H. Pfau*, H. Soifer, J. A. Sobota, A. Gauthier, C. R. Rotundu, J. C. Palmstrom, I. R. Fisher, G. Y. Chen, H. H. Wen, Z. X. Shen, P. S. Kirchmann

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


We determine the work functions of the iron arsenic compounds AFe2As2 (A=Ca,Ba,Cs) using photoemission spectroscopy to be 2.7 eV for CaFe2As2, 1.8 eV for BaFe2As2, and 1.3 eV for CsFe2As2. 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 BaFe2As2 and CsFe2As2 enable photoemission even from a common white LED light.

Original languageEnglish
Article number034801
JournalPhysical Review Materials
Issue number3
StatePublished - Mar 2020


Dive into the research topics of 'Low work function in the 122-family of iron-based superconductors'. Together they form a unique fingerprint.

Cite this