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Article Dans Une Revue Physical Review Materials Année : 2018

Linear behavior of the optical conductivity and incoherent charge transport in BaCoS 2

Résumé

Optical conductivity measurements on a BaCoS2 single crystal show an unusual linear behavior over a broad spectral range. In the paramagnetic phase above 300 K, the spectrum shows no gap, which contradicts the previously proposed scenario of a charge-transfer Mott insulator. Ab initio dynamical mean field theory calculations including a retarded Hubbard interaction explain the data in terms of an incipient opening of a Co(3d)-S(3p) charge-transfer gap concomitant to incoherent charge transport driven by electronic correlations. These results point to a non-Fermi liquid scenario with Hund's metal properties in the paramagnetic state, which arises from an incipient Mott phase destabilized by low-energy charge fluctuations across the vanishing 3d-3p charge-transfer gap.

Dates et versions

hal-01931393 , version 1 (22-11-2018)

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D. Santos-Cottin, Y. Klein, Ph. Werner, T. Miyake, L. De' Medici, et al.. Linear behavior of the optical conductivity and incoherent charge transport in BaCoS 2. Physical Review Materials, 2018, 2 (10), ⟨10.1103/PhysRevMaterials.2.105001⟩. ⟨hal-01931393⟩
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