Dresden 2026 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 94: Correlated Magnetism – Low-Dimensional Systems
TT 94.6: Talk
Friday, March 13, 2026, 11:00–11:15, HSZ/0101
Magnetic characterization of the spin-ladder magnet Bi2CuO3(SO4) — •Rodolfo A. Rangel Hernandez1, Alexander A. Tsirlin1, Victoria Ginga1, Kirill Povarov2, and Sergey Zvyagin2 — 1University of Leipzig, Leipzig, Germany — 2Helmholtz-Zentrum, Dresden-Rossendorf, Dresden, Germany
We present the first comprehensive magnetic characterization of Bi2CuO3(SO4), a spin-ladder magnet with ferromagnetic rungs and antiferromagnetic legs. Heat-capacity, susceptibility and magnetization measurements reveal characteristic signatures of a gapped low-dimensional quantum magnet. Ab initio DFT+U calculations, together with a Wannier-function analysis and quantum Monte Carlo (QMC) simulations, are used to describe the magnetism of the ladder. By fitting the experimental susceptibility with QMC, we estimate a spin-gap of Δ≈ 20 K and the leading exchange couplings to be J′≈ -208 K (rung) and J≈ 243 K (leg). Additionally, electron spin resonance confirms an extrinsic nature of the susceptibility upturn at low temperatures. Our result establishes Bi2CuO3(SO4) as a new realization of a spin-ladder with ferro- and antiferromagnetic interactions and provide reliable microscopic parameters for future research.
Keywords: Spin-ladder; Cuprate; Low-dimensional quantum magnet; DFT