Regensburg 2010 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 9: SC: Poster Session
TT 9.2: Poster
Montag, 22. März 2010, 14:00–18:00, Poster A
Angle resolved photoemission spectroscopy (ARPES) studies on Bi2201 and Bi2223 high temperature superconductors — •Jia Wei1,2, Martin Aeschlimann1, and Donglai Feng2 — 1Department of Physics, University of Kaiserslautern, Fachbereich Physik, Erwin Sch€oodinger Str. 46, 67663 Kaiserslautern, Germany — 21Department of Physics, Surface Physics Laboratory (National Key Laboratory) and Advanced Materials Laboratory, Fudan University, Shanghai 200433, P. R. China
The Bismuth-family of high temperature superconductors has played a vital role in the understanding of high temperature superconductivity. For the single layer system Bi2201, We observed the symbolic superconducting coherence peak in antinodal region for the first time. The 19 meV peak dip separation seriously challenges models based on electron*phonon interactions. Meanwhile, this energy scale and temperature dependence intriguingly correlate with the behaviors of spin fluctuations. For the trilayer Bi2223 system, its underdoped (UD) regime has been largely inaccessible so far. With elaborate vacuum annealing, we have succeeded in obtaining a series of UD samples for the first time. And we have identified a new experimental energy scale in the trilayer material, caused by trilayer band splitting, which shows very different behavior for bilayer band splitting in Bi2212.