Bogoliubov-quasiparticle spectra of the effective d-wave model for cuprate superconductivity
Journal Article
·
· Physical Review, B: Condensed Matter
- Department of Physics, Chiba University, Inage-ku, Chiba 263 (Japan)
- Department of Applied and Solid State Physics, University of Groningen, 9747AG Groningen (The Netherlands)
An exact-diagonalization technique on finite-size clusters is used to study the ground state and excitation spectra of the two-dimensional effective-fermion model, a fictious model of hole quasiparticles derived from numerical studies of the two-dimensional t-J model at low doping. We show that there is actually a reasonable range of parameter values where the d{sub x{sup 2}{minus}y{sup 2}}-wave pairing of holes occurs and the low-lying excitation can be described by the picture of Bogoliubov quasiparticles in the BCS pairing theory. The gap parameter of a size {Delta}{sub d}{approx_equal}0.13{vert_bar}V{vert_bar} (where V is the attractive interaction between holes) is estimated at low doping levels. The paired state gives way to the state of clustering of holes for some stronger attractions. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 544922
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 17 Vol. 56; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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