Low work function in the 122-family of iron-based superconductors
Abstract
Herein we determine the work functions of the iron arsenic compounds ( ) using photoemission spectroscopy to be 2.7 eV for , 1.8 eV for , and 1.3 eV for . The work functions of these 122 iron-based superconductors track those of the elementary metal but are substantially smaller. The most likely explanation of this observation is that the cleaving surface exposes only half an -layer. The low work function and good photoemission cross section of and enable photoemission even from a common white LED light.
- Authors:
-
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS); SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES)
- SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES); Tel Aviv Univ., Ramat Aviv (Israel)
- SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES); Stanford Univ., CA (United States). Geballe Lab. for Advanced Materials
- SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES)
- Nanjing Univ. (China)
- SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES); Stanford Univ., CA (United States). Geballe Lab. for Advanced Materials and Dept. of Physics
- Publication Date:
- Research Org.:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
- Sponsoring Org.:
- Alexander von Humboldt Foundation; German Science Foundation (DFG); Gabilan Stanford Graduate Fellowship; National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
- OSTI Identifier:
- 1605595
- Alternate Identifier(s):
- OSTI ID: 1603199
- Grant/Contract Number:
- AC02-76SF00515; DGE-114747; AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review Materials
- Additional Journal Information:
- Journal Volume: 4; Journal Issue: 3; Journal ID: ISSN 2475-9953
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE
Citation Formats
Pfau, H., Soifer, H., Sobota, J. A., Gauthier, A., Rotundu, C. R., Palmstrom, J. C., Fisher, I. R., Chen, G.-Y., Wen, H.-H., Shen, Z.-X., and Kirchmann, P. S. Low work function in the 122-family of iron-based superconductors. United States: N. p., 2020.
Web. doi:10.1103/PhysRevMaterials.4.034801.
Pfau, H., Soifer, H., Sobota, J. A., Gauthier, A., Rotundu, C. R., Palmstrom, J. C., Fisher, I. R., Chen, G.-Y., Wen, H.-H., Shen, Z.-X., & Kirchmann, P. S. Low work function in the 122-family of iron-based superconductors. United States. https://doi.org/10.1103/PhysRevMaterials.4.034801
Pfau, H., Soifer, H., Sobota, J. A., Gauthier, A., Rotundu, C. R., Palmstrom, J. C., Fisher, I. R., Chen, G.-Y., Wen, H.-H., Shen, Z.-X., and Kirchmann, P. S. Wed .
"Low work function in the 122-family of iron-based superconductors". United States. https://doi.org/10.1103/PhysRevMaterials.4.034801. https://www.osti.gov/servlets/purl/1605595.
@article{osti_1605595,
title = {Low work function in the 122-family of iron-based superconductors},
author = {Pfau, H. and Soifer, H. and Sobota, J. A. and Gauthier, A. 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.},
abstractNote = {Herein 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.},
doi = {10.1103/PhysRevMaterials.4.034801},
journal = {Physical Review Materials},
number = 3,
volume = 4,
place = {United States},
year = {Wed Mar 04 00:00:00 EST 2020},
month = {Wed Mar 04 00:00:00 EST 2020}
}
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