Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 3: Quantum Magnets and Molecular Magnets (joint session TT/MA)

MA 3.1: Vortrag

Montag, 12. März 2018, 09:30–09:45, H 3010

Frustrated spin ladders in quasi-1D S = 1/2 Heisenberg magnet balyakinite CuTeO₃ — •Helge Rosner¹ and Oleg Janson² — ¹Max-Planck-Institut für Chemische Physik fester Stoffe, Dresden, Deutschland — ²Institut für Festkörperphysik, TU Wien, Österreich

Copper tellurium oxides are enjoying increasing attention as a promising playground for quantum magnetism [1]. A chemically simple compound, the natural mineral balyakinite CuTeO₃ features an intricate crystal structure with Cu₂O₆ dimers connected by TeO₄ tetrahedra into a 3D network. Magnetization measurements indicate a sizable spin gap which is not closed in a magnetic field of 60 T. By using DFT calculations, we show that the magnetism of balyakinite is quasi-1D, and can be described by a frustrated ladder model with four antiferromagnetic exchanges: the dominant rung exchange J_⊥, sizable J_∥ and weak J_∥′ that alternate along both legs, as well as the weak frustrated cross-coupling J_×. Using the DFT+U estimates of the exchange integrals, we calculate the spin correlations in the ground state. Peculiarities of the magnetic excitation spectrum will be briefly discussed.
[1] M. R. Norman, arXiv:1708.05100.