Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 6: Quantum Magnets and Molecular Magnets (joint session TT/MA)
TT 6.1: 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.