1. EXAFS measurements on s209
Compositions where measurements were taken
(8 total measurements):
Co 100%
Co 80%
Co 50%
Co 20%
Mn 20%
Mn 50%
Mn 80%
Mn 100%
Approximate
Relative Doping Levels
Arrows designate sample position where data was taken.
Arrow color represents the energy region data was taken
(blue=Mn Edge, red=Co Edge).

2. XANES Standard Measurements
Compare these with EXAFS data to understand oxidation state of dopants. Probably should have done Co oxides too.
Various Mn States
Co metal film measured
Differences in Mn metal films measured

3. Co 100% Co EXAFS with Bragg reflection removed by hand
Mu(E) raw data and background fit.
Chi(k), reverse transform Chi(q), and forward transform window
Chi(R) and reverse transform window

4. Co 80% Co EXAFS with Bragg reflection removed by hand
Mu(E) raw data and background fit.
Chi(k), reverse transform Chi(q), and forward transform window
Chi(R) and reverse transform window

5. Co 50% Co EXAFS with Bragg reflection removed by hand
Mu(E) raw data and background fit.
Chi(k), reverse transform Chi(q), and forward transform window
Chi(R) and reverse transform window

6. Co 20% Co EXAFS with Bragg reflection removed by hand
Mu(E) raw data and background fit.
Chi(k), reverse transform Chi(q), and forward transform window
Chi(R) and reverse transform window

7. Co Comparison
Raw data
Normalized
Chi(k)
Chi(q)

8. Co Comparison: Chi(R)

9. Mn 100% Raw EXAFS data close up Mu(E) and background fit.
Chi(k), reverse transform Chi(q), and forward transform window
Chi(R) and reverse transform window

10. Mn 80% Raw EXAFS data close up Mu(E) and background fit.
Chi(k), reverse transform Chi(q), and forward transform window
Chi(R) and reverse transform window

11. Mn 50% Raw EXAFS data close up Mu(E) and background fit.
Chi(k), reverse transform Chi(q), and forward transform window
Chi(R) and reverse transform window

12. Mn 20% Raw EXAFS data close up Mu(E) and background fit.
Chi(k), reverse transform Chi(q), and forward transform window
Chi(R) and reverse transform window

13. Mn Comparison
Raw data
Normalized
Chi(k)
Chi(q)

14. Mn Comparison: Chi(R)

15. Current theory on dopant behavior
Co prefers substitutional site in Ge lattice
Large amounts of Co doping MAY cause interstitials
Mn, by itself, forms cubic Mn precipitates
Mn, with even trace amounts of Co, shows reduced diffusion and precipitation
Indirect evidence suggests Co & Mn form dimers
Co on a substitutional site and Mn on a neighboring interstitial site
Mn soluble in Ge prefers substitutional site
Energy barrier to interstitial site not as high as for Co