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

doi:10.1103/PhysRevMaterials.4.034801

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

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

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.

Original language	English
Article number	034801
Journal	Physical Review Materials
Volume	4
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevMaterials.4.034801
State	Published - Mar 2020

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10.1103/PhysRevMaterials.4.034801

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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.}",

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month = mar,

doi = "10.1103/PhysRevMaterials.4.034801",

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T1 - Low work function in the 122-family of iron-based superconductors

AU - Pfau, H.

AU - Soifer, H.

AU - Sobota, J. A.

AU - Gauthier, A.

AU - Rotundu, C. R.

AU - Palmstrom, J. C.

AU - Fisher, I. R.

AU - Chen, G. Y.

AU - Wen, H. H.

AU - Shen, Z. X.

AU - Kirchmann, P. S.

PY - 2020/3

Y1 - 2020/3

N2 - 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.

AB - 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.

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

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