Novel neutron resonance mode in dx2-y2-wave superconductors.
We show that a new resonant magnetic excitation at incommensurate momenta, observed recently by inelastic neutron scattering experiments on YBa2Cu3O6.85 and YBa2Cu3O6.6, is a spin exciton. Its location in the Brillouin zone and its frequency are determined by the momentum dependence of the particle-hole continuum. We identify several features that distinguish this novel mode from the previous resonance mode observed near Q=(pi,pi).
Eremin
I
I
Institut für Theoretische Physik, Freie Universität Berlin, D-14195, Berlin, Germany.
Morr
D K
DK
Chubukov
A V
AV
Bennemann
K H
KH
Norman
M R
MR