title: Observation of band renormalization effects in hole-doped high-Tc Superconductors.
abstract: We report a systematic high-resolution angle-resolved photoemission spectroscopy on high-T(c) superconductors Bi(2)Sr(2)Ca(n-1)Cu(n)O(2n+4) (n=1-3) to study the origin of many-body interactions responsible for superconductivity. For n=2 and 3, a sudden change in the energy dispersion, so called "kink", becomes pronounced on approaching (pi,0) in the superconducting state, while a kink appears only around the nodal direction in the normal state. For n=1, the kink shows no significant temperature dependence even across T(c). This could suggest that the coupling of electrons with Q=(pi,pi) magnetic mode is dominant in the superconducting state for multilayered cuprates, while the interactions at the normal state and that of single-layered cuprates have a different origin.
authors: Department of Physics, Tohoku University, Sendai 980-8578, Japan.
authors: T
authors: T
authors: Sato
authors: H
authors: H
authors: Matsui
authors: T
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authors: Takahashi
authors: H
authors: H
authors: Ding
authors: H-B
authors: HB
authors: Yang
authors: S-C
authors: SC
authors: Wang
authors: T
authors: T
authors: Fujii
authors: T
authors: T
authors: Watanabe
authors: A
authors: A
authors: Matsuda
authors: T
authors: T
authors: Terashima
authors: K
authors: K
authors: Kadowaki