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Phys Rev Lett. 2008 Feb 29;100(8):086402. Epub 2008 Feb 29.

Nonquasiparticle states in Co2MnSi evidenced through magnetic tunnel junction spectroscopy measurements.

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1
Institute of Theoretical Physics, Graz University of Technology, A-8010 Graz, Austria.

Abstract

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 nonquasiparticle states and their crucial contribution to the finite-temperature spin polarization in this material.

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