Observation of Band Renormalization Effects in Hole-Doped High-TcSuperconductors

T. Sato, H. Matsui, T. Takahashi, H. Ding, H.-B. Yang, S.-C. Wang, T. Fujii, T. Watanabe, A. Matsuda, T. Terashima, K. Kadowaki
2003 Physical Review Letters  
We report a systematic high-resolution angle-resolved photoemission spectroscopy on high-T c superconductors Bi 2 Sr 2 Ca nÿ1 Cu n O 2n4 (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 (; 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
more » ... ndence even across T c . This could suggest that the coupling of electrons with Q ; 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.
doi:10.1103/physrevlett.91.157003 pmid:14611488 fatcat:viq3hhl32jf35nvpgepyddtoe4