Resolved magnetic hyperfine spectra of Au-Fe alloys as a function of temperature

We have analyzed the Mössbauer hyperfine magnetic spectra of six compositions of Au-Fe from 10.5 to 33 at.% Fe at temperatures ranging from 4.2 K to the magnetic ordering temperature of each alloy. Only two elementary magnetic hyperfine spectra are required to fit the data, each of which has its own...

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Bibliographic Details
Published in:The Journal of physics and chemistry of solids 1987, Vol.48 (12), p.1239-1244
Main Authors: Borg, R.J., Violet, C.E.
Format: Article
Language:English
Subjects:
atomic short-range order
magnetic order
Mössbauer spectroscopy
Spin-glass
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Summary:We have analyzed the Mössbauer hyperfine magnetic spectra of six compositions of Au-Fe from 10.5 to 33 at.% Fe at temperatures ranging from 4.2 K to the magnetic ordering temperature of each alloy. Only two elementary magnetic hyperfine spectra are required to fit the data, each of which has its own value of the magnetic hyperfine field, quadrupole coupling, isomer shift, and relative intensities. The intensity ratios of the two spectra for a given Fe concentration are essentially invariant with temperature. These results point to the existence of two chemically different Fe sites with all the Fe atoms magnetically coupled over the entire temperature regime below the upper magnetic ordering temperature. A relatively sharp increase in the local moment commences at both Fe sites, at ∼ 17 at.% Fe and continues to increase with Fe concentration.
ISSN:0022-3697
1879-2553
DOI:10.1016/0022-3697(87)90011-4