Parity of the pairing bosons in a high-temperature Pb-Bi2Sr2CaCu2O8 bilayer superconductor by angle-resolved photoemission spectroscopy.
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.
Borisenko
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SV
Leibniz-Institute for Solid State Research, IFW-Dresden, P.O. Box 270116, D-01171 Dresden, Germany.
Kordyuk
A A
AA
Koitzsch
A
A
Fink
J
J
Geck
J
J
Zabolotnyy
V
V
Knupfer
M
M
Büchner
B
B
Berger
H
H
Falub
M
M
Shi
M
M
Krempasky
J
J
Patthey
L
L