Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 41: Frustrated Magnets - Spin Liquids - Experiments
TT 41.5: Vortrag
Dienstag, 13. März 2018, 11:15–11:30, H 3005
Crystal growth and magnetic characterization of novel kagome-type materials — •Christian Klein, Mahmoud Abdel-Hafiez, and Cornelius Krellner — Goethe-University, D-60438 Frankfurt am Main, Germany
Kagome-lattices are promising materials to investigate frustrated quantum spin systems with a possible quantum spin liquid (QSL) ground state [1]. High-quality single crystals are essential to distinguish between disordered magnetic ground-states and a true QSL.
We report on synthesis and characterization of Co-derivates of the spin-1/2 antiferromagnet material Barlowite (Cu4−xCox(OH)6BrF). The kagome-layers are build up by copper ions and separated from each other through a transition-metal cation, so that a quasi-two-dimensional system is created [2]. The non-magnetic material Zn4(OH)6BrF was synthesized to determine the magnetic contributions to the kagome-physicsThe synthesis was carried out under hydrothermal conditions. Single Crystals of Co-doped Barlowite were obtained as well as polycrystalline samples of the Zn-analogue of Barlowite. Characterization of the samples was done by magnetic measurements to determine the susceptibility and magnetic ordering. Furthermore heat capacity measurements were performed to investigate phase transitions and magnetic ordering at low temperature.
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