Observation of band renormalization effects in hole-doped high-Tc Superconductors |
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Authors: | Sato T Matsui H Takahashi T Ding H Yang H-B Wang S-C Fujii T Watanabe T Matsuda A Terashima T Kadowaki K |
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Institution: | Department of Physics, Tohoku University, Sendai 980-8578, Japan. |
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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. |
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