Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
DS: Fachverband Dünne Schichten
DS 15: Focus Session: Nickelate Superconductivity: Insights into Unconventional Pairing and Correlation Effects II (joint session TT/DS/MA)
DS 15.7: Vortrag
Donnerstag, 12. März 2026, 11:15–11:30, HSZ/0003
Correlated electronic structure of La3Ni2O6 and La3Ni2O6.5 — •Frank Lechermann, Steffen Bötzel, and Ilya M. Eremin — Theoretische Physik III, Fakultät für Physik und Astronomie, Ruhr-Universität Bochum, Bochum, Germany
There are two known superconducting nickelate families, i.e. low-valence Ni(3d9−δ) compounds and Ruddelsden-Popper (RP) compounds with Ni(3d8±δ) valence. While both families host NiO2 square planes, key difference is given by the missing apical oxygen atoms in the low-valence nickelates. A possible route to connect both nickelate families might be given by the reduction of the La3Ni2O7 RP bilayer compound, i.e. by removing it’s apical oxygens. Complete removal results in the La3Ni2O6 compound, while taking out only half of the apical oxygens results in the La3Ni2O6.5 compound. Both reduced materials are so far only scarcely characterized experimentally, but display quite intriguing correlation physics from theory. We will discuss the results of advanced first-principles many body calculations for these two nickelates, highlighting different mechanisms of Mott criticality as well as challenging low-temperature physics.
Keywords: density functional theory; dynamical mean-field theory; Kondo physics; flat band; orbital-selective Mott transition