Аннотация
Angle-resolved photoemission spectroscopy on optimally doped Bi2Sr2Ca0.92Y0.08Cu2O8+δ
uncovers a coupling of the electronic bands to a 40 meV mode in an
extended k-space region away from the nodal direction, leading to
a new interpretation of the strong renormalization of the electronic
structure seen in Bi2212. Phenomenological agreements with neutron
and Raman experiments suggest that this mode is the B1g oxygen bond-buckling
phonon. A theoretical calculation based on this assignment reproduces
the electronic renormalization seen in the data.
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