TY - JOUR
T1 - 57Fe Mössbauer study of stoichiometric iron-based superconductor CaKFe4As4
T2 - a comparison to KFe2As2 and CaFe2As2
AU - Bud’ko, Sergey L.
AU - Kong, Tai
AU - Meier, William R.
AU - Ma, Xiaoming
AU - Canfield, Paul C.
N1 - Publisher Copyright:
© 2017 Informa UK Limited, trading as Taylor & Francis Group.
PY - 2017/10/13
Y1 - 2017/10/13
N2 - 57Fe Mössbauer spectra at different temperatures between ∼5 and ∼ 300 K were measured on an oriented mosaic of single crystals of CaKFe4As4. The data indicate that CaKFe4As4 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’. The hyperfine parameters of CaKFe4As4 are compared with those for KFe2As2 measured in this work, and the literature data for CaFe2As2, and were found to be in between those for these two, ordered, 122 compounds, in agreement with the gross view of CaKFe4As4 as a structural analog of KFe2As2 and CaKFe4As4 that has alternating Ca- and K-layers in the structure.
AB - 57Fe Mössbauer spectra at different temperatures between ∼5 and ∼ 300 K were measured on an oriented mosaic of single crystals of CaKFe4As4. The data indicate that CaKFe4As4 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’. The hyperfine parameters of CaKFe4As4 are compared with those for KFe2As2 measured in this work, and the literature data for CaFe2As2, and were found to be in between those for these two, ordered, 122 compounds, in agreement with the gross view of CaKFe4As4 as a structural analog of KFe2As2 and CaKFe4As4 that has alternating Ca- and K-layers in the structure.
KW - Mössbauer spectroscopy
KW - Superconductors
KW - hyperfine parameters
UR - http://www.scopus.com/inward/record.url?scp=85021988966&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85021988966&partnerID=8YFLogxK
U2 - 10.1080/14786435.2017.1347726
DO - 10.1080/14786435.2017.1347726
M3 - Article
AN - SCOPUS:85021988966
SN - 1478-6435
VL - 97
SP - 2689
EP - 2703
JO - Philosophical Magazine
JF - Philosophical Magazine
IS - 29
ER -