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Charge and spin density perturbation on iron nuclei by non-magnetic impurities substituted on the iron sites in -Fe A. Błachowski 1 , K. Ruebenbauer 1 , J. Żukrowski 2 , J. Przewoźnik 2 1 Mössbauer Spectroscopy Division, Institute of Physics, - PowerPoint PPT Presentation
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Charge and spin density perturbation on iron nuclei by non-magnetic impurities
substituted on the iron sites in -Fe
A. Błachowski 1, K. Ruebenbauer 1, J. Żukrowski 2, J. Przewoźnik 2
1 Mössbauer Spectroscopy Division, Institute of Physics, Pedagogical University, Kraków, Poland
2 Solid State Physics Department, Faculty of Physics and Applied Computer Science,
AGH University of Science and Technology, Kraków, Poland
Fe100-cXc
- arc melting- ingots ~1.5 g- rapid quench of the molten state- metastable state
Lattice constant a and half-width of the <110> Bragg reflex versus impurity concentration c
Fe1-cAucFe1-cOsc
Binomial distribution
10 c impurity concentration [at.%]
..., ,2 ,1s subsequent coordination shells around 57Fe
sn number of vortices in the s-th shell 12 , 6 , 8 321 nnn
ss nk ..., ,1 ,0 number of impurities in the s-th shell
)3 lub 2(
at.% 5c
Example
Fe100-cXc
Hyperfine fields and isomer shifts for particular configuration having the contribution
00 , SB hyperfine field and total shift for 57Fe atoms
surrounded entirely by Fe atoms up to the outermost shell
ss SB , contributions to the hyperfine field and isomer shift due to a single impurity atom located in the s-th shell
}){|( sskncC
Fe100-cGac
Fe100-cGac
Fe100-cIrc
Fe100-cIrc
[W] S.M. Dubiel, W. Zinn, Phys. Rev. B 30, 3783 (1984).[Re] S.M. Dubiel, J. Magn. Magn. Mater. 69, 206 (1987).[Pt] S.M. Dubiel, Phys. Rev. B 37, 1429 (1988).
Correlation between average hyperfine field change per at.% of impurity
and
average isomer shift change per at.% of impurity
. ]Δ[ δ , ]Δ[ δσ
1
2)(σ
1
2)(
s
css
cs BBSS
Spin- and charge density oscillations
Average perturbations and for Ru, Ir and Ga impurities versus relative distance from the 57Fe nucleus
csS )(csB )(
ar /