57Fe Mössbauer study of stoichiometric iron-based superconductor CaKFe4As4: a comparison to KFe2As2 and CaFe2As2
Journal Article
·
· Philosophical Magazine (2003, Print)
- Ames Lab. and Iowa State Univ., Ames, IA (United States)
- Ames Lab. and Iowa State Univ., Ames, IA (United States); Princeton Univ., Princeton, NJ (United States)
- Chinese Academy of Sciences, Beijing (China); South Univ. of Science and Technology of China, Shenzhen (China)
57Fe Mössbauer spectra at different temperatures between ~5 and ~300 K were measured on an oriented mosaic of single crystals of CaKFe4 As4. The data indicate that is a well formed compound with narrow spectral lines, no traces of other, Fe – containing, secondary phases in the spectra and no static magnetic order. There is no discernible feature at the superconducting transition temperature in any of the hyperfine parameters. The temperature dependence of the quadrupole splitting approximately follows the empirical ‘T3/2 law’. Furthermore, the hyperfine parameters of CaKFe4 As4 are compared with those for measured in this work, and the literature data for CaFe2 As2, and were found to be in between those for these two, ordered, 122 compounds, in agreement with the gross view of CaKFe4 As4 as a structural analog of KFe2 As2 and CaFe2 As2 that has alternating Ca- and K-layers in the structure.
- Research Organization:
- Ames Laboratory (AMES), Ames, IA (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC02-07CH11358
- OSTI ID:
- 1379173
- Report Number(s):
- IS-J--9429
- Journal Information:
- Philosophical Magazine (2003, Print), Journal Name: Philosophical Magazine (2003, Print) Journal Issue: 29 Vol. 97; ISSN 1478-6435
- Publisher:
- Taylor & FrancisCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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