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arXiv · 2609.06246

Magnetization processes and spin dynamics across field-induced phase transitions in the quasi-two-dimensional quantum magnet Cu$_2$(OH)$_3$Br

Anneke Reinold·Dirk Wulferding·Laur Peedu·Kirill Amelin·Urmas Nagel·Toomas Rõõm·Zhiying Zhao·Patrick Pilch·Changqing Zhu·Hans Engelkamp·Lucas Berger·Denis I. Gorbunov·Yurii Skourski·Kwang-Yong Choi·Thomas Lorenz·Zhe Wang
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Abstract

We present magnetic-field-dependent evolution of magnetization and spin dynamics in the quasi-two-dimensional spin-$1/2$ magnet $\mathrm{Cu_2(OH)_3Br}$, consisting of alternately coupled ferromagnetic Cu1 and antiferromagnetic Cu2 spin chains. Terahertz spectroscopy reveals a pronounced field-direction dependence of the low-energy magnetic excitation spectrum. For magnetic fields applied perpendicular to the spin chains, $B\parallel a$ and $B\parallel c^*$, the spectra undergo abrupt reconstructions at the spin-flop transitions identified independently by high-field magnetization measurements. For $B\parallel b$, by contrast, no spin-flop occurs; instead, the excitation spectrum evolves continuously with field and exhibits a strong terahertz radiation polarization dependence as the ferromagnetic Cu1 subsystem becomes progressively polarized. At higher fields, the complex low-field spectrum is replaced by a reduced set of broad excitations, consistent with a weakening of the coupling between the ferromagnetic and antiferromagnetic chain subsystems. Complementary Raman spectroscopy resolves magnon and spinon excitations alongside several phonon modes and traces the characteristic temperature- and magnetic-field-dependent evolution of the magnetic excitations. The combined spectroscopic and magnetization results map out how a magnetic field reorganizes the coupled ferromagnetic and antiferromagnetic subsystems in $\mathrm{Cu_2(OH)_3Br}$ across field-induced phase transitions.

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Anneke Reinold, Dirk Wulferding, Laur Peedu, Kirill Amelin, Urmas Nagel, Toomas Rõõm, Zhiying Zhao, Patrick Pilch, Changqing Zhu, Hans Engelkamp, Lucas Berger, Denis I. Gorbunov, Yurii Skourski, Kwang-Yong Choi, Thomas Lorenz, Zhe Wang. 2026-09-05. Magnetization processes and spin dynamics across field-induced phase transitions in the quasi-two-dimensional quantum magnet Cu$_2$(OH)$_3$Br. https://arxiv.org/abs/2609.06246

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