Enhanced electron correlations in FeSb2
Abstract
FeSb2 has been recently identified as a new model system for studying many-body renormalizations in a d-electron based narrow gap semiconducting system, strongly resembling FeSi. The electron-electron correlations in FeSb2 manifest themselves in a wide variety of physical properties including electrical and thermal transport, optical conductivity, magnetic susceptibility, specific heat and so on. We review some of the properties that form a set of experimental evidences revealing the crucial role of correlation effects in FeSb2. The metallic state derived from slight Te doping in FeSb2, which has large quasiparticle mass, will also be introduced.
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