skip to main content
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

This content will become publicly available on March 1, 2021

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

Abstract

We determine the work functions of the iron arsenic compounds A Fe 2 As 2 ( A = Ca , Ba , Cs ) using photoemission spectroscopy to be 2.7 eV for CaFe 2 As 2 , 1.8 eV for BaFe 2 As 2 , and 1.3 eV for CsFe 2 As 2 . 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 BaFe 2 As 2 and CsFe 2 As 2 enable photoemission even from a common white LED light

Authors:
ORCiD logo [1]; ; ; ; ; ; ; ; ; ;
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1605595
Alternate Identifier(s):
OSTI ID: 1603199
Grant/Contract Number:  
[AC02-76SF00515; 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

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. 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., and Kirchmann, P. S. Sun . "Low work function in the 122-family of iron-based superconductors". United States. doi:10.1103/PhysRevMaterials.4.034801.
@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 = {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 = {2020},
month = {3}
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on March 1, 2021
Publisher's Version of Record

Save / Share:

Works referenced in this record:

Experimental Investigation of the Electronic Structure of Ca 0.83 La 0.17 Fe 2 As 2
journal, January 2013


Symmetry-breaking orbital anisotropy observed for detwinned Ba(Fe1-xCox)2As2 above the spin density wave transition
journal, April 2011

  • Yi, M.; Lu, D.; Chu, J. -H.
  • Proceedings of the National Academy of Sciences, Vol. 108, Issue 17
  • DOI: 10.1073/pnas.1015572108

2 × 2 structure and charge inhomogeneity at the surface of superconducting BaFe 2 x Co x As 2 ( x = 0 0.32 )
journal, March 2010


Determination of the phase diagram of the electron-doped superconductor Ba ( Fe 1 x Co x ) 2 As 2
journal, January 2009


Droplet-like Fermi surfaces in the anti-ferromagnetic phase of EuFe 2 As 2 , an Fe-pnictide superconductor parent compound
journal, January 2010


Surface Geometric and Electronic Structures of BaFe 2 As 2 ( 001 )
journal, August 2009


High-efficiency graded band-gap Al x Ga 1−x As/GaAs photocathodes grown by metalorganic chemical vapor deposition
journal, September 2011

  • Zhang, Yijun; Chang, Benkang; Niu, Jun
  • Applied Physics Letters, Vol. 99, Issue 10
  • DOI: 10.1063/1.3635401

Unconventional electronic reconstruction in undoped ( Ba , Sr ) Fe 2 As 2 across the spin density wave transition
journal, November 2009


Scanning Tunneling Spectroscopy and Vortex Imaging in the Iron Pnictide Superconductor BaFe 1.8 Co 0.2 As 2
journal, March 2009


Electronic structure of detwinned BaFe 2 As 2 from photoemission and first principles
journal, February 2011


Evidence for a Lifshitz transition in electron-doped iron arsenic superconductors at the onset of superconductivity
journal, May 2010

  • Liu, Chang; Kondo, Takeshi; Fernandes, Rafael M.
  • Nature Physics, Vol. 6, Issue 6
  • DOI: 10.1038/nphys1656

A Quantum Critical Point Lying Beneath the Superconducting Dome in Iron Pnictides
journal, March 2014


Anisotropy of the Electronic Work Function of Metals
journal, November 1941


Cleavage surfaces of the BaFe 2 x Co x As 2 and Fe y Se 1 x Te x superconductors: A combined STM plus LEED study
journal, October 2009


Formation of cesium peroxide and cesium superoxide on InP photocathode activated by cesium and oxygen
journal, October 2007

  • Sun, Yun; Liu, Zhi; Pianetta, Piero
  • Journal of Applied Physics, Vol. 102, Issue 7
  • DOI: 10.1063/1.2786882

Coupled structural and magnetic antiphase domain walls on BaFe 2 As 2
journal, August 2012


Data for "Low work function in the 122-family of iron-based superconductors"
dataset, January 2020


Photoelectron spectroscopic determination of the structure of (Cs,O) activated GaAs (110) surfaces
journal, March 1983

  • Su, C. Y.; Spicer, W. E.; Lindau, I.
  • Journal of Applied Physics, Vol. 54, Issue 3
  • DOI: 10.1063/1.332166

High-temperature superconductivity in iron-based materials
journal, August 2010

  • Paglione, Johnpierre; Greene, Richard L.
  • Nature Physics, Vol. 6, Issue 9
  • DOI: 10.1038/nphys1759

Symmetry-broken electronic structure and uniaxial Fermi surface nesting of untwinned CaFe 2 As 2
journal, December 2013


Surface Structure and Superconductivity in Ba(Fe 0.93 Co 0.07 ) 2 As 2 Probed by Scanning Tunneling Microscopy/Spectroscopy
journal, January 2011

  • Nishizaki, Terukazu; Nakajima, Yasuyuki; Tamegai, Tsuyoshi
  • Journal of the Physical Society of Japan, Vol. 80, Issue 1
  • DOI: 10.1143/JPSJ.80.014710

Orbital-Dependent Modifications of Electronic Structure across the Magnetostructural Transition in BaFe 2 As 2
journal, February 2010


Interaction of cesium and oxygen on W(110)
journal, February 1980


Surface structures of ternary iron arsenides A Fe 2 As 2 ( A = Ba , Sr, or Ca)
journal, May 2010


Theory of the Work Functions of Monovalent Metals
journal, July 1935


Dopant clustering, electronic inhomogeneity, and vortex pinning in iron-based superconductors
journal, June 2013


Ultrabright and Ultrafast III–V Semiconductor Photocathodes
journal, March 2014


Momentum Dependence of the Nematic Order Parameter in Iron-Based Superconductors
journal, August 2019


Spectroscopic scanning tunneling microscopy insights into Fe-based superconductors
journal, November 2011


Angle-resolved photoemission study of the role of nesting and orbital orderings in the antiferromagnetic phase of BaFe 2 As 2
journal, July 2011


Observation of Dirac Cone Electronic Dispersion in BaFe 2 As 2
journal, March 2010


Role of Antiferromagnetic Ordering in the ( 1 × 2 ) Surface Reconstruction of Ca ( Fe 1 x Co x ) 2 As 2
journal, February 2014


Band-structure reorganization across the magnetic transition in BaFe 2 As 2 seen via high-resolution angle-resolved photoemission
journal, October 2009


Observation of Ising spin-nematic order and its close relationship to the superconductivity in FeSe single crystals
journal, August 2016


(π, π) electronic order in iron arsenide superconductors
journal, January 2009

  • Zabolotnyy, V. B.; Inosov, D. S.; Evtushinsky, D. V.
  • Nature, Vol. 457, Issue 7229
  • DOI: 10.1038/nature07714

Impact of work function induced electric fields on laser-based angle-resolved photoemission spectroscopy
journal, August 2014

  • Fero, A.; Smallwood, C. L.; Affeldt, G.
  • Journal of Electron Spectroscopy and Related Phenomena, Vol. 195
  • DOI: 10.1016/j.elspec.2014.01.008

Energy scale of nematic ordering in the parent iron-based superconductor BaFe 2 As 2
journal, July 2019


Role of the orbital degree of freedom in iron-based superconductors
journal, October 2017


Detailed band structure of twinned and detwinned BaFe 2 As 2 studied with angle-resolved photoemission spectroscopy
journal, January 2019


Heat capacity study of BaFe 2 As 2 : Effects of annealing
journal, October 2010


Thermal emittance and response time measurements of negative electron affinity photocathodes
journal, March 2008

  • Bazarov, Ivan V.; Dunham, Bruce M.; Li, Yulin
  • Journal of Applied Physics, Vol. 103, Issue 5
  • DOI: 10.1063/1.2838209

Existence, Character, and Origin of Surface-Related Bands in the High Temperature Iron Pnictide Superconductor BaFe 2 x Co x As 2
journal, January 2011


Nanoscale surface element identification and dopant homogeneity in the high- T c superconductor Pr x Ca 1 x Fe 2 As 2
journal, May 2013


Probing the reconstructed Fermi surface of antiferromagnetic BaFe2As2 in one domain
journal, July 2019


Surface terminations and layer-resolved tunneling spectroscopy of the 122 iron pnictide superconductors
journal, April 2019