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TT: Fachverband Tiefe Temperaturen

TT 9: Correlated Magnetism – Low-Dimensional Systems

TT 9.3: Talk

Monday, March 17, 2025, 15:30–15:45, H33

Complex magnetic excitations in the alternating ferro-antiferromagnetic chain vompound Cu₂(OH)₃Br — •Kirill Povarov¹, Yurii Skourskii¹, J. Wosnitza^1,2, David Graf³, Zhiying Zhao⁴, and Sergei Zvyagin¹ — ¹Hochfeld-Magnetlabor Dresden (HLD-EMFL) and Würzburg-Dresden Cluster of Excellence ct.qmat, HZDR, Dresden — ²Institut für Festkörper- und Materialphysik, TU Dresden — ³National High Magnetic Field Laboratory, Tallahassee — ⁴Fujian Institute of Research of Structure of Matter, Fujian

We report the intricate spectrum of magnetic excitations in the mixed-chain quantum magnet Cu₂(OH)₃Br. Electron spin resonance (ESR) measurements in the frequency range between 0.1 and 1 THz reveal two distinct types of excitations: Low-energy modes of antiferromagnetic resonance (AFMR), and a high-energy excitation multiplet. The latter was argued to stem from mixing between the spinons and magnons, based on the results of zero-field neutron spectroscopy [1]. Peculiarities of their behavior in magnetic fields up to 16 T are discussed.

This work was supported by the Deutsche Forschungsgemeinschaft through the Würzburg-Dresden Cluster of Excellence on Complexity and Topology in Quantum Matter - ct.qmat (EXC 2147, project No. 390858490) and the SFB 1143, as well as by HLD at HZDR, member of the European Magnetic Field Laboratory (EMFL).

[1] Zhang et al., PRL 125, 037204 (2020).

Keywords: Quantum Magnetism; Magnetic excitations; Electron Spin Resonance