Article,
Magnetic collective mode dispersion in high-temperature superconductors
Phys. Rev. B, 63 (9): 092509 (February 2001)
DOI: 10.1103/PhysRevB.63.092509
Abstract
Recent neutron-scattering experiments in the superconducting state
of YBa2Cu3O6+x have been interpreted in terms of a magnetic collective
mode whose dispersion relative to the commensurate wave vector has
a curvature opposite in sign to a conventional magnon dispersion.
The purpose of this article is to demonstrate that simple linear-response
calculations are in support of a collective-mode interpretation,
and to explain why the dispersion has the curvature it does.
