SKM 2023 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 59: Poster Session: Topology
TT 59.18: Poster
Thursday, March 30, 2023, 15:00–18:00, P2/OG4
Quantum spin dynamics in the spin-chain compound Cu2OH3Br — •Anneke Reinold1, Kirill Amelin2, Zhiying Zhao3, Changqing Zhu1, Patrick Pilch1, Hans Engelkamp4, Toomas Rõõm2, Urmas Nagel2, and Zhe Wang1 — 1TU Dortmund University, Germany — 2National Institute of Chemical Physics and Biophysics, Tallinn, Estonia — 3Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, China — 4Radboud University, Nijmegen, The Netherlands
In low-dimensional quantum magnets, exotic spin phenomena can emerge due to strong spin fluctuations.
Here we investigate spin dynamics of the quantum spin-chain compound Cu2OH3Br by high-resolution terahertz spectroscopy as a function of temperature and in high magnetic fields. Below the Néel temperature TN=9.3 K, this compound exhibits a unique magnetic structure consisting of alternating ferromagnetic and antiferromagnetic spin-1/2-chains of Cu2+-ions [1,2]. In this ordered phase we observed magnetic excitations, which are characteristic for this unique spin structure and consistent with results of inelastic neutron scattering [2]. Moreover, we are able to track these spin excitations in applied magnetic fields crossing field-induced phase transitions [1].
[1] Z. Y. Zhao et al., J. Phys.: Condens. Matter 31, 275801 (2019)
[2] H. Zhang et al., Phys. Rev. Lett. 125, 037204 (2020)