Magnetovolume instabilities in the pressure dependence of the K-edge circular dichroism of Fe3C Invar particles

Details Magnetovolume instabilities in the pressure dependence of the K-edge circular dichroism of Fe3C Invar particles Magnetovolume instabilities in the pressure dependence of the K-edge circular dichroism of Fe3C Invar particles

2004-10-06

arxiv.org/abs/cond-mat/0410156v1

Physics

Condensed Matter

Materials Science

4 pages and 3 figures

Scientific paper

The p-electrons of carbon in the interstitial compound Fe3C hybridize with the Fe d-band and enhance the valence electron concentration of Fe from 8 to 8.67. At this concentration, substitutional 3d transition metals and alloys exhibit strong moment-volume coupling phenomena and associated magnetovolume instabilities, otherwise known as the Invar effect. For this reason, Fe3C is also expected to incorporate a strong magnetovolume instability, and therefore, we examine the pressure dependence of the of the K edge x-ray magnetic circular dichroism in Fe3C at ambient temperature and pressures up to 20 GPa. We and clear evidence for a high-moment to low-moment transition at about 10 GPa.

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