SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 44: Frustrated Magnets II
MA 44.4: Vortrag
Donnerstag, 30. März 2023, 15:45–16:00, HSZ 403
High-Frequency Electron Spin Resonance Studies on the Quasi One-Dimensional Spin-1/2 Quantum Magnet PbCuSeO4(OH)2 — •Rahel Ohlendorf, Daniel Knauer, Changhyun Koo, and Rüdiger Klingeler — Kirchhoff Institute for Physics, Heidelberg, Germany
We report high-frequency ESR studies on a polycrystalline sample of the frustrated quasi-1D spin-1/2 quantum material PbCuSeO4(OH)2, isostructural to the well-studied natural mineral linarite (PbCuSO4(OH)2). Magnetisation data show the evolution of a magnetically ordered phase below TN = 4.8 K and a spin-flop transition at BSF = 2.8 T. A complex magnetic phase diagram is constructed from the data. ESR measurements on a loose powder evidence a gapless linear excitation mode within the ground state, which can be traced across the spin-flop transition, as well as two linear excitation modes within the in-field phase with a zero field gap of −31±9 GHz and 32.9±1.4 GHz, respectively. Measurements on fixed powder reveal a gapped magnon mode in the ground state with a zero field splitting of 70±20 GHz. This mode might be accounted for by assuming an excitation of a spiral spin order in the ground state. Tracing the resonance positions with temperature suggests an easy-axis-type anisotropy with the paramagnetic g-factors 2.3 and 2.07. Changes in resonance position evidence the onset of short range fluctuations at around 70 K corresponding to 14× TN.