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TT: Fachverband Tiefe Temperaturen
TT 52: Nickelates II
TT 52.4: Vortrag
Mittwoch, 20. März 2024, 16:00–16:15, H 3010
Gap Structure Evolution of Infinite-Layer Lanthanum Nickelates from Enhanced Correlations — •Fabian Jakubczyk1,2, Armando Consiglio2,3, Domenico Di Sante4, Ronny Thomale2,3, and Carsten Timm1,2 — 1Institute of Theoretical Physics, Technische Universität Dresden, 01069 Dresden — 2Würzburg-Dresden Cluster of Excellence ct.qmat — 3Institut für Theoretische Physik und Astrophysik, Universität Würzburg, 97074 Würzburg, Germany — 4Department of Physics and Astronomy, University of Bologna, I-40127 Bologna, Italy
The newly discovered superconducting infinite-layer nickelates and in particular their gap symmetry pose challenges for the research community. For instance, controversial magnetotransport measurements point at either isotropic or anisotropic superconductivity, with possibly crucial impact of the rare-earth element. On the other hand, the existence of orbital-selective correlations, which are particularly strong for the Ni 3dx2−y2 orbital, seems to be generally accepted. In our work, we investigate potential spin-triplet superconductivity in lanthanum-based nickelates from the perspective of spin-fluctuation pairing and orbital selectivity. For this purpose, we construct a minimal model including Ni 3d, as well as La 5d degrees of freedom. A gap structure with odd parity indeed becomes favored for a reasonable choice of interaction strength and quasiparticle renormalization. We therefore identify LaNiO2 as a member of the nickelate family that is substantially different from isostructural d-wave cuprate superconductors.
Keywords: odd-parity; triplet superconductivity; spin-fluctuations; infinite-layer nickelates; LaNiO2