SKM 2023 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 50: Focus Session: Superconducting Nickelates II
TT 50.4: Vortrag
Donnerstag, 30. März 2023, 15:45–16:00, HSZ 03
GW+EDMFT investigation of Pr1−xSrxNiO2 under pressure — •Viktor Christiansson, Francesco Petocchi, and Philipp Werner — University of Fribourg, Fribourg, Switzerland
The recent experimental observation of a large pressure effect on Tc in Pr1−xSrxNiO2 opens up an interesting prospect for reaching even higher values of Tc in the nickelates. On the theoretical side, systematic changes with pressure also provides a new possibility for probing the single- versus multi-orbital nature of these systems. In this talk, we discuss the electronic structure of this system as a function of pressure and doping, based on numerical calculations using self-consistent GW+EDMFT. We show that the normal state properties demonstrate a non-trivial interplay between physical pressure and chemical doping, and we find small but systematic changes with increasing pressure. The proper treatment of correlation effects, beyond density functional theory, is shown to play an important role in revealing these trends. While the pressure dependent changes of the undoped compound suggest a more single-orbital-like behavior towards the high-pressure regime, a qualitatively different behavior is observed for the doped system with a multi-orbital nature manifesting itself also at high pressures.