Electronic Spectra and Their Relation to the ( π,π) Collective Mode in High- Tc Superconductors
/ Authors
J. Campuzano, J. Campuzano, H. Ding, M. Norman, H. Fretwell, M. Randeria, A. Kaminski, J. Mésot, T. Takeuchi, Toshihiro Sato
and 9 more authors
T. Yokoya, Takashi Takahashi, T. Mochiku, K. Kadowaki, P. Guptasarma, D. Hinks, Z. Konstantinović, Z. Li, H. Raffy
/ Abstract
The photoemission line shape near (pi, 0) in Bi(2)Sr(2)CaCu(2)O(8+delta) below T(c) is characterized by a sharp peak, followed at higher energy by a dip and hump. We study the evolution of this line shape as a function of momentum, temperature, and doping. We find the hump scales with the peak and persists above T(c) in the pseudogap state. We present strong evidence that the peak-dip-hump structure arises from the interaction of electrons with a collective mode of wave vector (pi, pi). The inferred mode energy and its doping dependence agree well with a magnetic resonance observed by neutron scattering.
Journal: Physical Review Letters