Ferromagnetic Instability in AFe4Sb12 (A = Ca, Sr, and Ba)

Details Ferromagnetic Instability in AFe4Sb12 (A = Ca, Sr, and Ba) Ferromagnetic Instability in AFe4Sb12 (A = Ca, Sr, and Ba)

2004-12-04

arxiv.org/abs/cond-mat/0412094v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 figures, submitted to PRL

Scientific paper

Magnetic, transport and thermal properties of AFe4Sb12 (A = Ca, Sr, Ba) are reported. All three compounds show a maximum in both the magnetic susceptibility and thermopower at 50 K, and a large electronic specific heat coefficient of 100 mJ/mol K2. These properties are the characteristics of a nearly ferromagnetic metal. Furthermore, a remanent moment of the order of 10-3muB/Fe was observed below 54, 48, and 40 K for A = Ca, Sr, and Ba, respectively. The volume fraction of the ferromagnetic component was estimated to be 10-20% by zero-field muSR measurements.

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