Parity of the Pairing Bosons in a High-Temperature Pb−Bi2Sr2CaCu2O8 Bilayer Superconductor by Angle-Resolved Photoemission Spectroscopy
S. V. Borisenko, A. A. Kordyuk, A. Koitzsch, J. Fink, J. Geck, V. Zabolotnyy, M. Knupfer, B. Büchner, H. Berger, M. Falub, M. Shi, J. Krempasky, L. Patthey
DOI 10.1103/PhysRevLett.96.067001 · Physical Review Letters
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Abstract
We report the observation of a novel effect in the bilayer Pb−Bi2Sr2CaCu2O8 (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 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Pb-Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 77 | Pressure not reported | unknown |
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