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Parity of the Pairing Bosons in a High-Temperature Superconductor

S. V. Borisenko·A. A. Kordyuk·A. Koitzsch·J. Fink·J. Geck·V. Zabolotnyy·M. Knupfer·B. Buechner·H. Berger·M. Falub·M. Shi·J. Krempasky·L. Patthey
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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.

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S. V. Borisenko, A. A. Kordyuk, A. Koitzsch, J. Fink, J. Geck, V. Zabolotnyy, M. Knupfer, B. Buechner, H. Berger, M. Falub, M. Shi, J. Krempasky, L. Patthey. 2005-05-08. Parity of the Pairing Bosons in a High-Temperature Superconductor. https://doi.org/10.1103/physrevlett.96.067001

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