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TT: Fachverband Tiefe Temperaturen
TT 23: Correlated Electrons – Poster I
TT 23.14: Poster
Montag, 9. März 2026, 18:00–20:00, P1
Heat Transport and Thermodynamic Properties of the Quasi-Two-Dimensional Quantum Magnet Cu2(OH)3Br — •Nainish Tickoo1, Rohit Sharma1, Lucas Berger1, Zhiying Zhao2, Zhe Wang3, and Thomas Lorenz1 — 1Institute of Physics II, University of Cologne, D-50937 Cologne, Germany — 2State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China — 3Department of Physics, TU Dortmund University, D-44227 Dortmund, Germany
Cu2(OH)3Br is a quasi-two-dimensional quantum magnet that can be seen as a system of coupled antiferromagnetic spin-1/2 chains. Specific heat, magnetisation and magnetostriction measurements have shown pronounced anomalies at TN = 9.3 K. These measurements, along with Monte Carlo simulations, have shown that below the TN, the system undergoes a field-induced transition from a 3D ordered state to a partially decoupled state when a magnetic field (Bc = 16.3 T) is applied transverse to the ordered spins. This transition is interpreted as a dimensional reduction arising from the distinct responses of the AFM chains to an external magnetic field [1]. This study examines the thermal conductivity κ (T, B) of Cu2(OH)3Br single crystals under magnetic fields applied along the crystallographic b axis. Strong anomalies in κ near TN reveal a significant interplay between phonons and magnetic excitations in low-temperature heat transport
Funded by the DFG via CRC 1238 Projects A01, B01 and B04.
[1] A. Reinoldet al., Phys. Rev. B 111, L100405 (2025)
Keywords: Antiferromagnetism; Thermal Conductivity; Heat Transport; Magnetic Coupling; Field Induced Transition