@article{d485016a34bd4e1c80b4d4e0872563d2,
title = "Low work function in the 122-family of iron-based superconductors",
abstract = "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.",
author = "H. Pfau and H. Soifer and Sobota, {J. A.} and A. Gauthier and Rotundu, {C. R.} and Palmstrom, {J. C.} and Fisher, {I. R.} and Chen, {G. Y.} and Wen, {H. H.} and Shen, {Z. X.} and Kirchmann, {P. S.}",
note = "Funding Information: H.P. acknowledges support from the Alexander von Humboldt Foundation and from the German Science Foundation (DFG) under reference PF 947/1-1. J.C.P. is supported by a Gabilan Stanford Graduate Fellowship and a NSF Graduate Research Fellowship (Grant No. DGE-114747). The work at the ALS is supported by US DOE under Contract No. DE-AC02-05CH11231. This work was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences, and Engineering Division, under Contract No. DE-AC02-76SF00515. Publisher Copyright: {\textcopyright} 2020 American Physical Society.",
year = "2020",
month = mar,
doi = "10.1103/PhysRevMaterials.4.034801",
language = "English (US)",
volume = "4",
journal = "Physical Review Materials",
issn = "2475-9953",
publisher = "American Physical Society",
number = "3",
}