Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 39: Superconductivity: (General) Theory
TT 39.3: Vortrag
Mittwoch, 22. März 2017, 10:00–10:15, HSZ 103
The T-dependence of the scattering rate in cuprates: Insights from diagrammatic extensions of DMFT — •Marie-Therese Philipp1,2, Georg Rohringer2, Clemens Watzenböck1, Thomas Schäfer1, Hartmut Hafermann3, Jan M. Tomczak1, Karsten Held1, Alexey Rubtsov2, and Alessandro Toschi1 — 1Institute of Solid State Physics, TU Wien, 1040 Vienna, Austria — 2Russian Quantum Center, Novaya street, 100, Skolkovo, Moscow region 143025, Russia — 3Mathematical and Algorithmic Sciences Lab, France Research Center, Huawei Technologies Co. Ltd., 92100 Boulogne-Billancourt, France
We analyze here some of the most recent experimental results[1] for the resistivity ρ and the Hall-resistivity ρH of the high-Tc superconducting cuprates. Surprisingly, the measured ratio ρ/ρH shows a universal, Fermi-liquid (FL) temperature dependence across the whole phase diagram. In the simplest Drude picture, this ratio would correspond to FL scattering rate (γ ∝ T2). In this context, γ can be computed in many-body theory from the imaginary part of the self-energy at the Fermi surface [−Im( Σ(w=0,kF) )]. In particular, to estimate −Im( Σ(w=0,kF) ), we have employed diagrammatic extensions of DMFT, namely the dual fermion (DF) approach and the dynamical vertex approximation (DΓA). The obtained temperature dependences will be compared to a more precise, but also challenging, direct estimate of ρ/ρH, by means of the *bubble-like* term of the corresponding conductivity tensors.
[1] N. Barišić, et al. (2015) arXiv:1507.07885