Separation of orbital contributions to the optical conductivity of BaVS3

  • 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≥160  meV of the quasiparticles in the A1g band. There is a pseudogap above TMI=69  K, and in the insulating phase the gap follows the BCS-like temperature dependence of the structural order parameter with Δch≈42  meV in the ground state. The MIT is described in terms of a weakly coupled two-band model.

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Author:István KézsmárkiORCiDGND, G. Mihály, R. Gaál, N. Barišić, A. Akrap, H. Berger, L. Forró, C. C. Homes, L. Mihály
Frontdoor URL
Parent Title (English):Physical Review Letters
Publisher:American Physical Society (APS)
Year of first Publication:2006
Publishing Institution:Universität Augsburg
Release Date:2018/11/29
First Page:186402
Institutes:Mathematisch-Naturwissenschaftlich-Technische Fakultät
Mathematisch-Naturwissenschaftlich-Technische Fakultät / Institut für Physik
Mathematisch-Naturwissenschaftlich-Technische Fakultät / Institut für Physik / Lehrstuhl für Experimentalphysik V
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Licence (German):Deutsches Urheberrecht