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.
| Author: | István KézsmárkiORCiDGND, G. Mihály, R. Gaál, N. Barišić, A. Akrap, H. Berger, L. Forró, C. C. Homes, L. Mihály |
|---|---|
| URN: | urn:nbn:de:bvb:384-opus4-442096 |
| Frontdoor URL | https://opus.bibliothek.uni-augsburg.de/opus4/44209 |
| ISSN: | 0031-9007OPAC |
| ISSN: | 1079-7114OPAC |
| Parent Title (English): | Physical Review Letters |
| Publisher: | American Physical Society (APS) |
| Type: | Article |
| Language: | English |
| Year of first Publication: | 2006 |
| Publishing Institution: | Universität Augsburg |
| Release Date: | 2018/11/29 |
| Volume: | 96 |
| Issue: | 18 |
| First Page: | 186402 |
| DOI: | https://doi.org/10.1103/physrevlett.96.186402 |
| 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 |
