Mössbauer study of Ba2Ti2Fe2As4O

R. Pohjonen; J. Lindén; Shi Huai Sun; Guang Han Cao

doi:10.1016/j.jallcom.2020.155706

Mössbauer study of Ba₂Ti₂Fe₂As₄O

R. Pohjonen, J. Lindén^*, Shi Huai Sun, Guang Han Cao

^*Corresponding author for this work

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Abstract

A superconductive Ba₂Ti₂Fe₂As₄O oxypnictide sample was synthesized following a solid-state reaction route. X-ray diffraction followed by Rietveld analysis was used for checking the phase content. ⁵⁷Fe Mössbauer spectroscopy in transmission geometry was used for characterizing the hyperfine parameters of the iron site. Ba₂Ti₂Fe₂As₄O is paramagnetic at least down to 77 K in contrast to the BaFe₂As₂ parent phase, which exhibits a spin-density order below ∼140 K. Fitting the isomer shift and spectral absorption data with the Debye model yielded Debye temperatures of 280–320 K.

Original language	English
Article number	155706
Journal	Journal of Alloys and Compounds
Volume	848
DOIs	https://doi.org/10.1016/j.jallcom.2020.155706
Publication status	Published - 25 Dec 2020
MoE publication type	A1 Journal article-refereed

Keywords

Fe Mössbauer spectroscopy
Pnictide superconductors
Rietveld analysis
Second-order Doppler shift

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https://urn.fi/URN:NBN:fi-fe202201147726

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title = "M{\"o}ssbauer study of Ba2Ti2Fe2As4O",

abstract = "A superconductive Ba2Ti2Fe2As4O oxypnictide sample was synthesized following a solid-state reaction route. X-ray diffraction followed by Rietveld analysis was used for checking the phase content. 57Fe M{\"o}ssbauer spectroscopy in transmission geometry was used for characterizing the hyperfine parameters of the iron site. Ba2Ti2Fe2As4O is paramagnetic at least down to 77 K in contrast to the BaFe2As2 parent phase, which exhibits a spin-density order below ∼140 K. Fitting the isomer shift and spectral absorption data with the Debye model yielded Debye temperatures of 280–320 K.",

keywords = "Fe M{\"o}ssbauer spectroscopy, Pnictide superconductors, Rietveld analysis, Second-order Doppler shift",

author = "R. Pohjonen and J. Lind{\'e}n and Sun, {Shi Huai} and Cao, {Guang Han}",

year = "2020",

month = dec,

day = "25",

doi = "10.1016/j.jallcom.2020.155706",

language = "English",

volume = "848",

journal = "Journal of Alloys and Compounds",

issn = "0925-8388",

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TY - JOUR

T1 - Mössbauer study of Ba2Ti2Fe2As4O

AU - Pohjonen, R.

AU - Lindén, J.

AU - Sun, Shi Huai

AU - Cao, Guang Han

PY - 2020/12/25

Y1 - 2020/12/25

N2 - A superconductive Ba2Ti2Fe2As4O oxypnictide sample was synthesized following a solid-state reaction route. X-ray diffraction followed by Rietveld analysis was used for checking the phase content. 57Fe Mössbauer spectroscopy in transmission geometry was used for characterizing the hyperfine parameters of the iron site. Ba2Ti2Fe2As4O is paramagnetic at least down to 77 K in contrast to the BaFe2As2 parent phase, which exhibits a spin-density order below ∼140 K. Fitting the isomer shift and spectral absorption data with the Debye model yielded Debye temperatures of 280–320 K.

AB - A superconductive Ba2Ti2Fe2As4O oxypnictide sample was synthesized following a solid-state reaction route. X-ray diffraction followed by Rietveld analysis was used for checking the phase content. 57Fe Mössbauer spectroscopy in transmission geometry was used for characterizing the hyperfine parameters of the iron site. Ba2Ti2Fe2As4O is paramagnetic at least down to 77 K in contrast to the BaFe2As2 parent phase, which exhibits a spin-density order below ∼140 K. Fitting the isomer shift and spectral absorption data with the Debye model yielded Debye temperatures of 280–320 K.

KW - Fe Mössbauer spectroscopy

KW - Pnictide superconductors

KW - Rietveld analysis

KW - Second-order Doppler shift

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DO - 10.1016/j.jallcom.2020.155706

M3 - Article

AN - SCOPUS:85089695077

SN - 0925-8388

VL - 848

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

M1 - 155706

ER -

Mössbauer study of Ba₂Ti₂Fe₂As₄O

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