Abstract

We have studied the electronic structure of a metallic antiferromagnet ${\mathrm{V}}_{5}$${\mathrm{S}}_{8}$ above the N\'eel temperature by photoemission spectroscopy. The V 3s core-level peak shows a splitting dominated by the exchange splitting resulting from the high-spin ${\mathit{d}}^{2}$(${\mathrm{V}}^{3+}$) configuration in the ground state. On the contrary, the valence-band photoemission spectra are in good agreement with band-structure calculations that show a high density of states at the Fermi level. In order to reconcile these apparently contradictory results, we propose that the on-site d-d Coulomb energy is effectively reduced from the average Coulomb energy through Hund's-rule coupling and that this leads to the metallic state even though the average Coulomb energy may be comparable to or exceed the one-electron V 3d-${\mathit{t}}_{2\mathit{g}}$ band width. While the local-moment picture is sufficient to explain the paramagnetic state, itinerant character also has to be taken into account to consider the antiferromagnetic state.

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