Dresden 2026 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 69: Focus Session: Nickelate Superconductivity: Insights into Unconventional Pairing and Correlation Effects II (joint session TT/DS/MA)
TT 69.10: Vortrag
Donnerstag, 12. März 2026, 12:00–12:15, HSZ/0003
Interlayer interaction-driven s±-to-dxy-wave superconductivity in La3Ni2O7 under pressure — •Lauro B. Braz1, George B. Martins2, and Luis G. G. de V. D. Da Silva1 — 1Instituto de Física, Universidade de São Paulo, Rua do Matão 1371, São Paulo, São Paulo 05508-090, Brazil — 2Instituto de Física, Universidade Federal de Uberlândia, Uberlândia, Minas Gerais 38400-902, Brazil
Experimental and theoretical progress on the normal-state properties of the high-temperature superconductor La3Ni2O7 has provided evidence of strong interlayer interactions. To better understand the effects of interlayer interactions in La3Ni2O7 under high pressure, we investigate a two-layer, two-orbital electron model that includes both intra- and interlayer Coulomb interaction terms within the framework of the matrix random-phase approximation. Our analysis reveals that interlayer interactions play a crucial role in determining the preferred superconducting pairing symmetry. Specifically, when interlayer interactions are included, a dxy-wave pairing symmetry is favored over the s±-wave symmetry, which was previously found to dominate in their absence. Furthermore, we find that interlayer interactions enhance interorbital pairing by incorporating contributions from all three electron pockets, which originate from both d3z2−r2 and dx2−y2 orbital characters. This results in the emergence of nodes in the superconducting gap function - features absent in the s±-wave state - ultimately stabilizing the dxy-wave pairing symmetry.
Keywords: unconventional superconductivity; matrix random-phase approximation; nickelates