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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

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✦ 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.


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