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TT: Tiefe Temperaturen

TT 9: Supraleitung: Eigenschaften, elektronische Struktur, Ordnungsparameter

TT 9.3: Vortrag

Dienstag, 9. März 2004, 10:15–10:30, H20

Anomalous enhancement of the coupling strength upon underdoping in Pb-Bi2212. — •Sergey Borisenko, Alexander Kordyuk, Andreas Koitzsch, Martin Knupfer, and Joerg Fink — Institute for Solid State Research, IFW-Dresden

Angle-resolved photoemission spectroscopy is used to study the mass renormalization of the charge carriers in the high-Tc superconductor (Pb,Bi)₂Sr₂CaCu₂O_8+δ (Pb-Bi2212) in the vicinity of the (π, 0)-point in the superconducting and the normal states. 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 coupling to a bosonic collective mode is observed below Tc for both bands, in particular, for the underdoped case. Above Tc , a weaker coupling to a continuous spectrum of modes is detected.