Unexpected Ferromagnetism in Alkaline-Earth Silicides

Details Unexpected Ferromagnetism in Alkaline-Earth Silicides Unexpected Ferromagnetism in Alkaline-Earth Silicides

2009-09-02

arxiv.org/abs/0909.0434v1

Physics

Condensed Matter

Other Condensed Matter

preprint form: 9 pages, 3 double figures

Scientific paper

Ferromagnetism without transition metals has been the subject of intense debate. Here, we report measurements performed on high purity crystals of alkaline-earth silicides ({\AE}Si), where we found weak ferromagnetism at room temperature. The small saturation moment is not correlated to the number of electrons in d states. However, {\AE} d-states are part of a badly conducting network, as a result of charge transfer and mixing with the Si valence band. Polarization of a low density electron gas is the most likely explanation of the observed moment of $\sim 10^{-5}_{}\mu^{}_{\rm B}$ per formula unit.

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