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TT: Fachverband Tiefe Temperaturen

TT 47: Frustrated Magnets II (joint session MA/TT)

TT 47.8: Vortrag

Mittwoch, 11. März 2026, 11:30–11:45, POT/0361

Synthesis and H-T phase diagram of Cu₂(OH)₃HCOO — •Issei Niwata^1,2, Kaushick K. Parui¹, Maxim Avdeev³, Anton A. Kulbakov¹, Dmytro S. Inosov¹, and Darren C. Peets¹ — ¹TU Dresden, Dresden, Germany — ²Hokkaido University, Sapporo, Japan — ³ANSTO, Sydney, Australia

Cu₂(OH)₃X (X=monovalent anion) consists of quasi one-dimensional (1D) ferromagnetic (FM) and antiferromagnetic (AFM) chains which alternate to form two-dimensional triangular layers, which are stacked along the c axis. As the interchain interactions are frustrated and interlayer interactions are weak, the system can be regarded as weakly coupled 1D FM and AFM chains. In bulk measurements, these compounds typically show AFM behavior with a Néel temperature (T_N) below 10 K. Because of the coexistence of FM and AFM chains, exotic magnetic excitations are expected. As a matter of fact, for X=Br⁻, inelastic neutron scattering revealed magnon excitations and a gapped spinon continuum in the same energy range. In addition, for X=NO₃⁻, the realization of a Tomonaga-Luttinger-liquid state in the AFM chain was suggested in magnetic fields around 20 T, where the magnetization shows a half saturation indicating full polarization of the FM chains. Recently, we grew single crystals of the X=HCOO⁻ compound. Magnetization measurements showed T_N=5.4 K and a half saturation below 5 T, much lower than X=NO₃⁻. This suggests that we can explore the excitation structure in relatively low magnetic fields. I will discuss the phase diagram obtained by physical properties measurements.

Keywords: frustrated magnets; synthesis; magnetic measurements; specific heat measurements; Cu-based minerals