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

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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year = "2020",

month = mar,

doi = "10.1103/PhysRevMaterials.4.034801",

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volume = "4",

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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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DO - 10.1103/PhysRevMaterials.4.034801

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JO - Physical Review Materials

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

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