DPG Phi
Verhandlungen
Verhandlungen
DPG

Berlin 2024 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

TT: Fachverband Tiefe Temperaturen

TT 5: Nickelates I

TT 5.2: Vortrag

Montag, 18. März 2024, 09:45–10:00, H 3007

Electronic correlations and superconducting instability in La3Ni2O7 under high pressureFrank Lechermann, •Jannik Gondolf, Steffen Bötzel, and Ilya M. Eremin — Institut für Theoretische Physik III, Ruhr-Universität Bochum, D-44780 Bochum, Germany

Motivated by the report of superconductivity in bilayer La3Ni2O7 at high pressure, we examine the interacting electrons in this system. First-principles many-body theory is utilized to study the normal-state electronic properties. Below 100 K, a multi-orbital non-Fermi liquid state resulting from loss of Ni-ligand coherence within a flat-band dominated low-energy landscape is uncovered. The incoherent low-temperature Fermi surface displays strong mixing between Ni-dz2 and Ni-dx2y2 orbital character. In a model-Hamiltonian picture, spin fluctuations originating mostly from the Ni-dz2 orbital give rise to strong tendencies towards a superconducting instability with B1g or B2g order parameter. The dramatic enhancement of Tc in pressurized La3Ni2O7 is due to stronger Ni-dz2 correlations compared to those in the infinite-layer nickelates.

Keywords: unconventional Superconductiviy; high-Tc; strong correlations

100% | Mobil-Ansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2024 > Berlin