Spin–1 Neutron Resonance Peak Cannot Account for Electronic Anomalies in the Cuprate Superconductors

In certain cuprates, a spin-1 resonance mode is prominent in the magnetic structure measured by
neutron scattering. It has been proposed that this mode is responsible for significant features seen in
other spectroscopies, such as photoemission and optical absorption, which are sensitive to the charge
dynamics, and even that this mode is the boson responsible for “mediating” the superconducting pairing.
We show that its small (measured) intensity and weak coupling to electron-hole pairs (as deduced from
the measured lifetime) disqualifies the resonant mode from either proposed role.

Hae-Young Kee,1,2 Steven A. Kivelson,1 and G. Aeppli3
1Department of Physics, University of California–Los Angeles, Los Angeles, California 90095-1547
2Department of Physics, University of Toronto, Toronto, Ontario M5S 1A7, Canada
3NEC Research Institute, 4 Independence Way, Princeton, New Jersey 08540