Strongly Enhanced Curie Temperature in Carbon-Doped Mn5Ge3 Films

Details Strongly Enhanced Curie Temperature in Carbon-Doped Mn5Ge3 Films Strongly Enhanced Curie Temperature in Carbon-Doped Mn5Ge3 Films

1999-05-19

arxiv.org/abs/cond-mat/9905280v2

J. Magn. Magn. Mater., Vol. 221, 248 (2000)

Physics

Condensed Matter

Materials Science

4 pages, 3 figures, minor changes in text

Scientific paper

10.1016/S0304-8853(00)00494-7

The structural and magnetic properties of Mn5Ge3Cx films prepared at elevated substrate temperatures TS are investigated. In particular, films with x >= 0.5 and TS = 680 K exhibit a strongly enhanced Curie temperature TC = 440 K compared to Mn5Ge3 with TC = 304 K. Structural analysis of these films suggests that the carbon is interstitially incorporated into the voids of Mn octahedra of the hexagonal Mn5Si3-type structure giving rise to a lattice compression. The enhanced ferromagnetic stability in connection with the lattice compression is interpreted in terms of an Mn-Mn interaction mediated by C based on a change in the electronic structure.

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