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TT: Fachverband Tiefe Temperaturen
TT 29: Frustrated Magnets: General
TT 29.5: Talk
Wednesday, March 29, 2023, 10:30–10:45, HSZ 201
Study of CoNb2O6 magnetic properties from first principles — •Amanda Konieczna1, Kira Riedl1, Roser Valenti1, and Radu Coldea2 — 1Goethe-Universität, Frankfurt am Main, Germany — 2University of Oxford, Oxford, England
The quasi-one-dimensional ferromagnet CoNb2O6 offers an interesting playground to investigate the interplay of anisotropic magnetic interactions in real materials. A variety of magnetic models was proposed for this material, including longer-range Heisenberg exchange, dominant anisotropic Ising and bond-dependent Kitaev-type magnetic interactions.
In this talk, we discuss our theoretical approach to extract the magnetic exchange in CoNb2O6. We first obtain material-specific hoppings from ab-initio methods and proceed by moving from a description in terms of the Hubbard model to the Spin Hamiltonian using exact diagonalization and perturbation theory. Finally, we will discuss how our results fit into the picture of available results for this system, both on the theoretical and experimental side.
We gratefully acknowledge funding by the DFG (German Research Foundation): QUAST-FOR5249 - 449872909 (Project TP4).