Comparative study of organic metals and high- cuprates
✍ Scribed by S. Barišić; O.S. Barišić
- Book ID
- 103887028
- Publisher
- Elsevier Science
- Year
- 2009
- Tongue
- English
- Weight
- 201 KB
- Volume
- 404
- Category
- Article
- ISSN
- 0921-4526
No coin nor oath required. For personal study only.
✦ Synopsis
The Bechgaard salts and the high T c cuprates are described by two and three band models, respectively, with the lowest band (nearly) half filled. In organics the interactions are small, while in cuprates the repulsion U d on the Cu-site is the largest energy. The Mott-AF state is stable in undoped materials in both cases. In the metallic phase of cuprates the U d ! 1 limit produces a moderate effective repulsion. The theories of the coherent SDW and charge-transfer correlations in the metallic phases of organics and cuprates are thus similar. In (undoped) organics those correlations are associated with commensurate 2k F SDW and 4k F bond or site modes. The corresponding modes in metallic cuprates are the incommensurate SDW and in particular O x /O y quadrupolar charge transfer with wave vector 2q SDW ¼ q 0 þ G. They are enhanced for dopings x40, which bring the Fermi level close to the van Hove singularity. Strong coupling to the lattice associates the static incommensurate O x /O y charge transfer with collinear ''nematic'' stripes. In contrast to organics, the coherent correlations in cuprates compete with local d 10 2d 9 quantum charge-transfer disorder.
📜 SIMILAR VOLUMES