Correlation effects in half-metallic ferromagnets: magnetic tunnel junction spectroscopy
and nonquasiparticle states

Enrico Arrigoni,

TU Graz, Theoretical and Computational Physics, Graz, Austria

We investigate the effects of electronic correlations in the full-Heusler Co2MnSi, by combining a theoretical analysis of the spin-resolved density of states with tunneling-conductance spectroscopy measurements using Co2MnSi as electrode. Both experimental and theoretical results confirm the existence of so-called non-quasiparticle states and their crucial contribution to the finite-temperature spin polarisation in this material.

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