Abstract
We present a systematic study of the magnetization, Hall effect and specific heat on single crystals of Mn 4Si 7. Curie–Weiss law is observed above 43 K. At low-temperature moments order in an anisotropic helical state and are aligned above 1 T. We observe an anomalous Hall effect in both ρ H vs. B and in R H vs. T curves and a field dependence of the low T specific heat due to spin fluctuations. The magnetic moments ( p eff and p sat) are the lowest reported for similar itinerant magnetic systems, this suggests that Mn 4Si 7 is a good candidate to observe critical quantum fluctuations expected for a marginal Fermi liquid.
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