Physics – Condensed Matter – Superconductivity
Scientific paper
2003-03-20
Phys. Rev. Lett. 91, 167002 (2003)
Physics
Condensed Matter
Superconductivity
4 revtex pages, 4 eps figures
Scientific paper
10.1103/PhysRevLett.91.167002
Angle-resolved photoemission spectroscopy (ARPES) is used to study the mass renormalization of the charge carriers in the high-T_c superconductor (Pb,Bi)_2Sr_2CaCu_2O_8 in the vicinity of the (pi,0) point in the superconducting and the normal state. Using matrix element effects at different photon energies and due to a high momentum and energy resolution the bonding and the antibonding bands could be separated in the whole dopant range. A huge anisotropic coupling to a bosonic collective mode is observed below T_c for both bands in particular for the underdoped case. Above T_c, the more isotropic coupling to a continuum or a mode at much higher energy is significantly weaker.
Berger Heinz
Borisenko S. V.
Fink Joerg
Kim Kang-Tae
Knupfer Martin
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