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Coupling of the $B_1g$ Phonon to the Antinodal Electronic States of Bi$_2$Sr$_2$Ca$_0.92$Y$_0.08$Cu$_2$O$_8+\delta$

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Phys. Rev. Lett., 93 (11): 117003 (сентября 2004)
DOI: 10.1103/PhysRevLett.93.117003

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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