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TT: Fachverband Tiefe Temperaturen
TT 57: Poster: Superconductivity I
TT 57.6: Poster
Thursday, March 30, 2023, 15:00–18:00, P2/OG2
Screening in a two-band model for infinite-layer nickelate — •Tharathep Plienbumrung1,2, Maria Daghofer1,2, Michael Schmid3, and Andrzej M. Oles4,5 — 1Institute for Functional Matter and Quantum Technologies, University of Stuttgart, Stuttgart, Germany — 2Center for Integrated Quantum Science and Technology, University of Stuttgart, Stuttgart, Germany — 3Waseda Research Institute for Science and Engineering, Waseda University, Tokyo, Japan — 4Max Planck Institute for Solid State Research, Stuttgart, Germany — 5Institute of Theoretical Physics, Jagiellonian University, Kraków, Poland
Considering two-band model for infinite-layered nickelates, containing d- and s-like orbitals, on two-dimensional lattice. The extended nature of the s-like orbital leads to less electronic correlation. We thus parameterize the electronic correlations of the s-like orbital by introducing screening parameter. With exact diagonalization, we calculate the pairing symmetries and other electronic properties of the two-band model on two-dimensional lattice. We find that the screening strength of the s-like band plays an important role in the electronic properties of the two-band model. Interestingly, depending on the screening strength of s-like band, we find both d- and s-wave pairing symmetries within the two-band model. In strong screening, the d-wave pairing is found while the s-wave pairing is formed in the weak screening regime. The phase diagram of the two-band model for different ratio of J/U is also presented.