Van Hove excitons and high-Tc superconductivity

✍ Scribed by R.S. Markiewicz

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 360 KB
• Volume: 165-166
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/s0921-4526(09)80112-9

✦ Synopsis

I summarize recent work on a model which relates high-temperature superconductivity to 'excitons' (short-range charge density wave [CDWj order fluctuations) near the van Hove singularity of the CU02 sheets. The model explains the anomalous normal state properties, predicts a pinning of the Fermi energy at a preferred hole concentration, describes the crossover from an antiferromagnetic Mott insulator near half filling to a correlated Fermi liquid in the doped material, and suggests that the superconducting transition is similar to that found in the A15 compounds, but enhanced by effects oflower dimensionality.

*. This research supported in part by the DOD-SDIO, through a subcontract from Intermagnetics General Corporation.