Magnetic instabilities in Fe3C cementite particles observed with Fe K-edge x-ray circular dichroism under pressure.
The ferromagnetic interstitial iron compound Fe(3)C (cementite) is expected to have Invar properties, whereby a high-moment to low-moment transition should occur when the atomic volume is reduced below a critical value. We, therefore, examine the pressure dependence of the Fe K-edge x-ray magnetic circular dichroism in Fe(3)C at ambient temperature and pressures up to 20 GPa. We find clear evidence for a high-moment to low-moment transition around 10 GPa.
Duman
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E
Experimentalphysik, Universität Duisburg-Essen, D-47048 Duisburg, Germany.
Acet
M
M
Wassermann
E F
EF
Itié
J P
JP
Baudelet
F
F
Mathon
O
O
Pascarelli
S
S