Regensburg 2025 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 16: Superconductivity: Properties and Electronic Structure II
TT 16.12: Vortrag
Dienstag, 18. März 2025, 12:30–12:45, H32
Rise and fall of the pseudogap in the Emery model: Insights for cuprates — •Mario O. Malcolms1, Henri Menke1,2, Yi-Tin Tseng2, Eric Jacob3, Karsten Held3, Philipp Hansmann3, and Thomas Schaefer1 — 1Max-Planck-Institut für Festkörperforschung — 2University of Erlangen-Nürnberg — 3Institute of Solid State Physics, TU Wien
The intriguing properties of layered cuprate superconductors have not lost their fascination since their discovery. The physical mechanisms behind this rich phenomenology -after almost 40 years of intense community effort- are still highly debated. The reason for the latter is deeply routed in the fact that cuprates are strongly interacting quantum many-body systems, many of whose properties cannot be explained by a simple single-particle picture: their electrons are strongly correlated in space and in time. Adding to the complexity of this material class it has been realized early on, that due to the hybridization of copper dx2−y2- and oxygen px/y-orbitals in the relevant two-dimensional layers, the undoped parent compounds are charge-transfer, rather than (single-orbital) Mott-Hubbard insulators. The adequate minimal theoretical modellization of cuprates, hence, has to include the oxygen p-orbitals on top of the copper-d ones, enabling, among other properties, (Zhang-Rice) singlet-formation between these orbitals. In this work we make significant progress in the universal description of the cuprates’ phase diagrams by extending the powerful λ-corrected dynamical vertex approximation (DΓA) to the three-band Emery model.
Keywords: Cuprates; Pseudogap; Spin fluctuations; many-body crossovers