Abstract
We report the observation of a novel effect in the bilayer Pb-Bi2Sr2CaCu2O8
(Pb-Bi2212) high-T(c) superconductor by means of angle-resolved photoemission
with circularly polarized excitation. Different scattering rates,
determined as a function of energy separately for the bonding and
antibonding copper-oxygen bands, strongly imply that the dominating
scattering channel is odd with respect to layer exchange within a
bilayer. This is inconsistent with a phonon-mediated scattering and
favors the participation of the odd collective spin excitations in
the scattering mechanism in near-nodal regions of the k space, suggesting
a magnetic nature of the pairing mediator.
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