Berlin 2024 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 75: Low Dimensional Systems
TT 75.2: Vortrag
Donnerstag, 21. März 2024, 15:15–15:30, H 3007
Quantum spin dynamics across field-induced phase transitions in the spin-chain compound Cu2(OH)3Br — •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 magnetic phenomena can emerge due to strong spin fluctuations. Here we investigate quantum spin dynamics of the spin-1/2 chain compound Cu2(OH)3Br by high-resolution terahertz spectroscopy as a function of temperature and in high magnetic fields. Below a Néel temperature of TN = 9.3 K, this compound exhibits a unique magnetic structure consisting of alternating ferromagnetically and antiferromagnetically aligned chains of Cu2+ spins. In this ordered phase we observe magnetic excitations, which are characteristic for this unique spin structure and consistent with previous results of inelastic neutron scattering experiments. Crossing a field-induced quantum phase transition, we reveal different characteristics of spin dynamics for the high-field phase.
Keywords: Quantum Spin Dynamics; Low-Dimensional Spin System; Geometrical Frustration; Fourier-Transform Infrared Spectroscopy