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TT: Fachverband Tiefe Temperaturen
TT 61: Topology – Poster
TT 61.7: Poster
Mittwoch, 11. März 2026, 15:00–17:00, P4
Magnetic Properties of Single Crystal MnNb2O6 — •Florian Kübelbäck1, Leo Maximov1, Andreas Bauer1, and Christian Pfleiderer1,2,3 — 1School of Natural Sciences, Technical University of Munich, Garching, Germany — 2Heinz Maier-Leibnitz-Zentrum (MLZ), Technische Universität München, Garching, Germany — 3Munich Center for Quantum Science and Technology (MCQST), Technical University of Munich, Garching, Germany
CoNb2O6, with effective S=12 Ising chains, is a benchmark system for quasi-one-dimensional magnetism and field-induced quantum phenomena [1]. Its isostructural analogue columbite MnNb2O6 contains S=52 Mn2+ ions arranged in zig-zag chains and is expected to realise a more classical regime of low-dimensional magnetism [2, 3].
We have grown high-quality MnNb2O6 single crystals using the optical floating-zone technique. Magnetization measurements reproduce the antiferromagnetic transition at TN ≈ 4.4 K and reveal anisotropy with the c-axis acting as the hard direction, consistent with the recently refined phase diagram [4]. Field sweeps for H ∥ c show a spin-flop transition near 1.8 T.
These results establish MnNb2O6 as a clean, anisotropic antiferromagnet and a promising classical counterpart to the quantum S=12 chain material CoNb2O6.
[1] R. Coldea et al., Science 327, 5962 (2010)
[2] L. M. Holmes et al., Solid State Communications 11, 409 (1972)
[3] O. V. Ni elsen et al., J. Phys. C 9 (1979)
[4] R. Maruthi et al., J. Phys.: Condens. Matter 33, 345801 (2021)
Keywords: low dimensionality; low temperature magnetism