Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 47: Superconductivity: Properties and Electronic Structure 2
TT 47.3: Vortrag
Mittwoch, 22. März 2017, 15:45–16:00, HSZ 103
Changing the Start-point in the Cuprates — •Carsten Putzke — University of Bristol
Far over-doped Tl2Ba2CuO6+δ is one of the cleanest and best understood members of the cuprate family. In this material quantum oscillation, specific heat and Hall effect measurements show good agreement with one another as well as band structure calculations. Choosing this as a start-point and reducing the oxygen stoichiometry enables to tune this system from far over-doped (Tc < 4.2 K) to optimal doping (Tc = 94 K) and even into the under-doped region. Thereby covering the entire over-doped part of the phase diagram. This proves particularly interesting as it allows us to study electronic correlation without the complication of the manifold ground states observed in the under-doped part of the phase diagram.
Starting from a Fermi-liquid like behaviour in far over-doped samples I will show results of the magnetoresistance and Hall effect in pulsed magnetic field that demonstrate the evolution of the electronic properties upon approaching the highest critical temperature in the system and the deviations from this evolution that accompany the entrance to the under doped regime.