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Magnetization processes and spin dynamics across field-induced phase transitions in the quasi-two-dimensional quantum magnet Cu2(OH)3Br

  • 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
4 more authors
  • Yurii Skourski
  • Kwang-Yong Choi
  • Thomas Lorenz
  • Zhe Wang
Open at sourcePDFDOICite

Abstract

We present magnetic-field-dependent evolution of magnetization and spin dynamics in the quasi-two-dimensional spin-1/2 magnet Cu2(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∥ a and B∥ c*, the spectra undergo abrupt reconstructions at the spin-flop transitions identified independently by high-field magnetization measurements. For B∥ 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 Cu2(OH)3Br across field-induced phase transitions.

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Cite

BibTeXRIS
BibTeX
@misc{reinold2026magnetization,
  title = {{Magnetization processes and spin dynamics across field-induced phase transitions in the quasi-two-dimensional quantum magnet Cu$_2$(OH)$_3$Br}},
  author = {Anneke Reinold and Dirk Wulferding and Laur Peedu and Kirill Amelin and Urmas Nagel and Toomas Rõõm and Zhiying Zhao and Patrick Pilch and Changqing Zhu and Hans Engelkamp and Lucas Berger and Denis I. Gorbunov and Yurii Skourski and Kwang-Yong Choi and Thomas Lorenz and Zhe Wang},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.06246},
  eprint = {2609.06246},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.06246},
}
RIS
TY  - UNPB
TI  - Magnetization processes and spin dynamics across field-induced phase transitions in the quasi-two-dimensional quantum magnet Cu_2(OH)_3Br
AU  - Anneke Reinold
AU  - Dirk Wulferding
AU  - Laur Peedu
AU  - Kirill Amelin
AU  - Urmas Nagel
AU  - Toomas Rõõm
AU  - Zhiying Zhao
AU  - Patrick Pilch
AU  - Changqing Zhu
AU  - Hans Engelkamp
AU  - Lucas Berger
AU  - Denis I. Gorbunov
AU  - Yurii Skourski
AU  - Kwang-Yong Choi
AU  - Thomas Lorenz
AU  - Zhe Wang
PY  - 2026
DA  - 2026/09/05
PB  - arXiv
DO  - 10.48550/arxiv.2609.06246
UR  - https://arxiv.org/abs/2609.06246
AB  - We present magnetic-field-dependent evolution of magnetization and spin dynamics in the quasi-two-dimensional spin-1/2 magnet 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∥ a and B∥ c^*, the spectra undergo abrupt reconstructions at the spin-flop transitions identified independently by high-field magnetization measurements. For B∥ 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 Cu_2(OH)_3Br across field-induced phase transitions.
ER  -