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TT: Fachverband Tiefe Temperaturen
TT 72: Correlated Magnetism – Spin Liquids I
TT 72.5: Vortrag
Donnerstag, 12. März 2026, 10:30–10:45, HSZ/0105
Microscopic modelling of the honeycomb system Na3Ni2BiO6 and its field-induced phases — •Amanda Anna Konieczna, Panagiotis Stavropoulos, and Roser Valentí — Goethe Universität, Frankfurt am Main, Germany
Frustration in magnetic systems has for decades provided a central testbed for the investigation of unconventional properties. Among others, frustrated systems may show magnetic-field-induced phases with characteristic magnetization plateaus, as is the case in triangular lattice and Kagome lattice spin-1/2 systems, where magnetic frustration arises due to the geometry of the lattice. Although the honeycomb lattice geometry is not geometrically frustrated, frustration may still appear due to bond-dependent magnetic exchanges, as proven by the Kitaev honeycomb model with its quantum spin liquid ground state.
Experimental evidence for a one-third magnetization plateau at intermediate magnetic fields has been reported for the spin-1 honeycomb compound Na3Ni2BiO6. The aim of this talk is to present our approach based on an ab initio scheme in order to understand the origin of the plateau phase. The approach involves the modeling of an ab-initio-derived multiorbital relativistic Hubbard Hamiltonian and utilize projective diagonalization techniques to construct an effective spin model. The data extracted from the model is compared to and discussed in the context of experimental findings.
Keywords: Frustration; Magnetism; Field-Induced Phases; One-third magnetization plateau; Honeycomb