Parity of the Pairing Bosons in a High-Temperature Superconductor

Details Parity of the Pairing Bosons in a High-Temperature Superconductor Parity of the Pairing Bosons in a High-Temperature Superconductor

2005-05-08

arxiv.org/abs/cond-mat/0505192v1

Phys. Rev. Lett. 96, 067001 (2006)

Physics

Condensed Matter

Superconductivity

5 RevTex pages, 4 eps figures

Scientific paper

10.1103/PhysRevLett.96.067001

We report the observation of a novel effect in the bilayer Pb-Bi2212 high-TC 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 favours 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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