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

Research output: Contribution to journalArticle

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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 - 2006

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orbitals
conductivity
insulators
metals
electrons
infrared spectroscopy
conduction
temperature dependence
anisotropy
ground state
scattering
energy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Separation of orbital contributions to the optical conductivity of BaVS3. / Kézsmárki, I.; Mihály, G.; Gaál, R.; Bariić, N.; Akrap, A.; Berger, H.; Forró, L.; Homes, C. C.; Mihály, L.

In: Physical Review Letters, Vol. 96, No. 18, 186402, 2006.

Research output: Contribution to journalArticle

Kézsmárki, I, Mihály, G, Gaál, R, Bariić, N, Akrap, A, Berger, H, Forró, L, Homes, CC & Mihály, L 2006, 'Separation of orbital contributions to the optical conductivity of BaVS3', Physical Review Letters, vol. 96, no. 18, 186402. https://doi.org/10.1103/PhysRevLett.96.186402
Kézsmárki, I. ; Mihály, G. ; Gaál, R. ; Bariić, N. ; Akrap, A. ; Berger, H. ; Forró, L. ; Homes, C. C. ; Mihály, L. / Separation of orbital contributions to the optical conductivity of BaVS3. In: Physical Review Letters. 2006 ; Vol. 96, No. 18.
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