How strongly correlated is MnSi?

Details How strongly correlated is MnSi? How strongly correlated is MnSi?

2006-01-23

arxiv.org/abs/cond-mat/0601509v1

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

We present an experimental study of the electronic structure of MnSi. Using X-ray Absorption Spectroscopy, X-ray photoemission and X-ray fluorescence we provide experimental evidence that MnSi has a mixed valence ground state. We show that self consistent LDA supercell calculations cannot replicate the XAS spectra of MnSi, while a good match is achieved within the atomic multiplet theory assuming a mixed valence ground state. We discuss the role of the electron-electron interactions in this compound and estimate that the valence fluctuations are suppressed by a factor of 2.5, which means that the Coulomb repulsion is not negligible.

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