Separation of orbital contributions to the optical conductivity of BaVS3

I. Kézsmárki, G. Mihály, R. Gaál, N. Bariić, A. Akrap, H. Berger, L. Forró, C. C. Homes, L. Mihály

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Abstract

The correlation-driven metal-insulator transition (MIT) of BaVS3 was studied by polarized infrared spectroscopy. In the metallic state two types of electrons coexist at the Fermi energy: The quasi-1D metallic transport of A1g electrons is superimposed on the isotropic hopping conduction of localized Eg electrons. The "bad-metal" character and the weak anisotropy are the consequences of the large effective mass meff >7me and scattering rate Γ 160meV of the quasiparticles in the A1g band. There is a pseudogap above TMI=69K, and in the insulating phase the gap follows the BCS-like temperature dependence of the structural order parameter with Δch >42meV in the ground state. The MIT is described in terms of a weakly coupled two-band model.

Original languageEnglish
Article number186402
JournalPhysical review letters
Volume96
Issue number18
DOIs
Publication statusPublished - May 22 2006

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Kézsmárki, I., Mihály, G., Gaál, R., Bariić, N., Akrap, A., Berger, H., Forró, L., Homes, C. C., & Mihály, L. (2006). Separation of orbital contributions to the optical conductivity of BaVS3. Physical review letters, 96(18), [186402]. https://doi.org/10.1103/PhysRevLett.96.186402