Parity of the Pairing Bosons in a High-Temperature Superconductor

Abstract

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.

5 RevTex pages, 4 eps figures

References in corpus (6)

• Self-consistent self-energy analysis of photoemission data
• Bare electron dispersion from photoemission experiments
• Two resonant magnetic modes in an overdoped high-${\mathbf{T}}_{\mathbf{c}}$ superconductor
• Manifestation of the magnetic resonance mode in the nodal quasiparticle lifetime in superconducting cuprates
• Circular dichroism in angle-resolved photoemission spectra of under- and overdoped Pb-Bi2212
• Circular dichroism and bilayer splitting in the normal state of underdoped (Pb,Bi)${}_2$Sr${}_2$(Ca${}_x$Y${}_{1-x}$)Cu${}_2$O${}_{8+\delta }$ and overdoped (Pb,Bi)${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$

Cited by in corpus (9)

• Experimental setup for low-energy laser-based angle resolved photoemission spectroscopy
• Unmasking the nodal quasiparticle dynamics in cuprate superconductors using low-energy photoemission
• ARPES experiment in fermiology of quasi-2D metals (Review Article)
• An ARPES view on the high-Tc problem: phonons vs spin-fluctuations
• Aspects of Electron-Phonon Self-Energy Revealed from Angle-Resolved Photoemission Spectroscopy
• A reevaluation of the coupling to a bosonic mode of the charge carriers in (Bi,Pb)${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ at the antinodal point
• Dual character of the electronic structure in YBa2Cu4O8: conduction bands of CuO2 planes and CuO chains
• Excitation of a bosonic mode by electron tunneling into a cuprate superconductor
• On the cuprates' universal waterfall feature: evidence of a momentum-driven crossover