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Mean Field Approach to Double-Occupancy Induced Pairing in Oxide Superconductors
Abstract The double-occupancy induced pairing mechanism (DOM for short) of superconductivity1–7 applies to systems with strongly correlated narrow energy bands in which an on-site repulsive electron-electron interaction U plays an important role. Imagine first a band with only spin degeneracy and an electron occupation, written as (1−xh), assumed less than unity per atom.xh is then the number of holes per site. Assume U = ∞, so double occupancy is projected out. If the system is not magnetic, i.e. a Fermi liquid, it’s energy scale, i.e. the band width for quasiparticles, is proportional to xh times the U = 0 band width8–11. This is because electrons can only hop into empty sites, whose concentration xh then enters the intersite hopping rate and thus band width. The reduction factor can be as large as.01 in heavy fermion materials.
Mean Field Approach to Double-Occupancy Induced Pairing in Oxide Superconductors
Abstract The double-occupancy induced pairing mechanism (DOM for short) of superconductivity1–7 applies to systems with strongly correlated narrow energy bands in which an on-site repulsive electron-electron interaction U plays an important role. Imagine first a band with only spin degeneracy and an electron occupation, written as (1−xh), assumed less than unity per atom.xh is then the number of holes per site. Assume U = ∞, so double occupancy is projected out. If the system is not magnetic, i.e. a Fermi liquid, it’s energy scale, i.e. the band width for quasiparticles, is proportional to xh times the U = 0 band width8–11. This is because electrons can only hop into empty sites, whose concentration xh then enters the intersite hopping rate and thus band width. The reduction factor can be as large as.01 in heavy fermion materials.
Mean Field Approach to Double-Occupancy Induced Pairing in Oxide Superconductors
Newns, D. M. (author)
Novel Superconductivity ; 515-519
1987-01-01
5 pages
Article/Chapter (Book)
Electronic Resource
English
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