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TT: Fachverband Tiefe Temperaturen
TT 37: Correlated Electrons: Poster
TT 37.23: Poster
Mittwoch, 19. März 2025, 15:00–18:00, P4
Magnetic Order in the Low-Dimensional Quantum Magnet Cu2(OH)3Br — •S. Luther1, Z. Wang2, A. Reinold2, Z. Zhao3, J. Wosnitza1,4, and H. Kühne1 — 1Hochfeld-Magnetlabor Dresden, HZDR — 2Fakultät Physik, TU Dortmund — 3Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences — 4Institut für Festkörper- und Materialphysik, TU Dresden
Low-dimensional quantum magnets, such as the quasi-two-dimensional spin system Cu2(OH)3Br, can host exotic phenomena and ground states. We will present results of high-field magnetization and nuclear magnetic resonance (NMR) spectroscopy that probe the microscopic details of the magnetic structure at finite magnetic fields. In Cu2(OH)3Br, the Cu2+ ions in the distorted crystal structure form alternating ferromagnetic and antiferromagnetic spin-1/2 chains with finite interchain coupling, leading to a Néel temperature of 9.3 K at zero field. Here, we investigate the phase diagram for H||b, where a splitting of the NMR spectral lines below TN and elevated fields reveals a commensurate long-range antiferromagnetic order. Maxima in the temperature-dependent spin-lattice relaxation rate 1/T1 at different magnetic fields indicate the transition temperature to the ordered phase. An anomaly in the high-field magnetization at low temperatures and around 16 T suggests the suppression of the magnetically ordered phase.
Keywords: Low-dimensional quantum magnet; Nuclear magnetic resonance; High-field magnetization