Spin, Charge, and Bonding in Transition Metal Mono Silicides

Details Spin, Charge, and Bonding in Transition Metal Mono Silicides Spin, Charge, and Bonding in Transition Metal Mono Silicides

1997-09-01

arxiv.org/abs/cond-mat/9709018v1

Physica B 244 (1998), 138-147

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, 9 figures in encapsulated postscript format, LATEX, macros: espcrc2.sty epsf.sty, LEES97, to be published in Physica

Scientific paper

10.1016/S0921-4526(97)00476-6

We review some of the relevant physical properties of the transition metal mono-silicides with the FeSi structure (CrSi, MnSi, FeSi, CoSi, NiSi, etc) and explore the relation between their structural characteristics and the electronic properties. We confirm the suggestion orginally made by Pauling, that the FeSi structure supports two quasi-atomic d-states at the transition metal atom. This shell contains from 0 to 4 electrons in the sequence CrSi to NiSi. In FeSi the two quasi-atomic d-electrons are responsible for the high temperature S=1 state, which is compensated for T=0 by two itinerant electrons associated with the Fe-Si resonance bonds.

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