Article,

Magnetic collective mode dispersion in high-temperature superconductors

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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.

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