Slave Boson Approach to The Neutron Scattering in YBCO Superconductors
Strongly Correlated Electrons
2009-10-31 v2 Superconductivity
Abstract
The evolution of the so-called `41meV resonance' in the magnetic response of YBCO cuprates is studied with slave-boson theory for the t-t'-J-model. The resonance appears as a collective spin fluctuation in the d-wave superconducting (SC) state. It is undamped at optimal doping due to a threshold in the excitation energies of particle--hole pairs with relative wave vector (pi,pi). When hole filling is reduced, the resonance moves to lower energies and broadens. Below the resonance energy we find a crossover to an incommensurate response in agreement with a recent experiment on YBa_2CU_3O_6.6. We show that dynamic nesting in the d-wave SC state causes this effect.
Cite
@article{arxiv.cond-mat/9811038,
title = {Slave Boson Approach to The Neutron Scattering in YBCO Superconductors},
author = {Jan Brinckmann and Patrick A. Lee},
journal= {arXiv preprint arXiv:cond-mat/9811038},
year = {2009}
}
Comments
few changes in text, typos corrected, references updated