Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 63: Quantum Magnets and Molecular Magnets (joint session TT/MA)

TT 63.4: Vortrag

Donnerstag, 19. März 2020, 16:00–16:15, HSZ 304

Quantum magnetism in Boleite - an Archimedean Solid with strong magnetic frustrationStefan Lebernegg1,2, Jürgen Schnack3, Oleg Janson4, Johannes Richter5, Jörg Sichelschmidt2, Tobias Förster6, Alexander Tsirlin7, and •Helge Rosner21Technical University of Munich, 80335, Munich, Germany — 2Max-Planck-Institut für Chemische Physik fester Stoffe, 01187 Dresden, Germany — 3Bielefeld University, Faculty of Physics, Universitätsstr. 25, D-33615 Bielefeld, Germany — 4IFW Dresden Helmholtzstraße 20 01069 Dresden Germany — 5Max Planck Institute for the Physics of Complex Systems, 01187 Dresden Germany — 6Dresden High Magnetic Field Laboratory — 7Experimental Physics VI, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, 86135 Augsburg, Germany

Combined theoretical and experimental effort, applying electronic structure calculations and numerical simulations as well as chemical analysis, X-ray diffraction and magnetic measurements had to be joined by mineralogical expertise to unveil the quantum magnetism of the mineral Boleite. This mineral is a strongly frustrated quantum magnet with 24 spin 1/2 Cu sites arranged on the vortices of a truncated cube, one of the famous Archimedean solids. We find that the system with its typical 1/3 magnetization plateau can be well understood by two leading interactions and their "randomness" describing a certain distribution of these exchange interactions.

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