Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9781608 | Journal of Physics and Chemistry of Solids | 2005 | 5 Pages |
Abstract
The concept of exchange in strongly-correlated fermions is reviewed with emphasis on the generalization of the Heisenberg pair exchange to higher order n-particle permutations. The 'frustration' resulting from competing ferromagnetic three-spin exchange and antiferromagnetic two- and four-spin exchanges is illustrated on a two-dimensional model system: solid 3He films. Recent experimental results proving the presence of significant four-spin exchange interactions in the CuO2 plaquettes of high Tc cuprates are reported.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Electronic, Optical and Magnetic Materials
Authors
Michel Roger,