Regensburg 2025 – scientific programme

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MA: Fachverband Magnetismus

MA 21: Frustrated Magnets I

MA 21.8: Talk

Wednesday, March 19, 2025, 11:30–11:45, H18

Magnetic Properties of the Frustrated Cu-based Quantum Magnets Posnjakite, Kobyashevite, and Ktenasite — Kaushick K. Parui¹, Anton A. Kulbakov¹, Roman Gumeniuk², Sergey Granovsky¹, Dmytro S. Inosov¹, and •Darren C. Peets¹ — ¹IFMP, TU Dresden, Germany — ²IEP, TU Bergakademie Freiberg, Germany

Posnjakite, kobyashevite, and ktenasite are copper hydroxide sulphates in which the magnetic copper sites are arranged in distorted-triangular planes. Such a magnetic sublattice is expected to lead to strong geometric frustration, which can produce exotic magnetic order. We report the synthesis of all three materials and the results of our investigations into their low temperature magnetic properties by magnetization, specific heat, and diffraction. All three compounds indeed exhibit low magnetic transition temperatures with high frustration factors, confirming that frustration plays a key role in selecting their magnetic ground states.

Keywords: frustrated magnets; synthesis; magnetic measurements; specific heat measurements; minerals