Regensburg 2019 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 50: Poster Session: Correlated Electrons 2
TT 50.9: Poster
Mittwoch, 3. April 2019, 15:00–18:30, Poster D
Crystal growth and magnetic characterization of novel kagome-type materials — •Christian Klein1, Mahmoud Abdel-Hafiez1,2, and Cornelius Krellner1 — 1Physikalisches Institut, Goethe-Universität Frankfurt am Main, Max-von-Laue-Straße 1, D-60438 Frankfurt am Main — 2Department of Physics, Harvard University, 17 Oxford Street, Cambridge, MA 02138
Kagome-lattices are promising materials to investigate frustrated quantum spin systems with a possible quantum spin liquid (QSL) ground state [1].
We report on synthesis and characterization of the spin-1/2 antiferromagnet material Barlowite (Cu4(OH)6BrF) and the isostructural Cl-analogue Claringbullite (Cu4(OH)6ClF). 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]. Substitution with a non-magnetic ion on the interlayer position leads to a magnetic decoupling between the kagome layers. The synthesis was carried out under hydrothermal conditions [3]. Single Crystals of Claringbullite were obtained as well as polycrystalline samples of the Zn-doped Barlowite. Characterization of the samples was done by x-ray diffraction, energy dispersive x-ray analysis and thermodynamic measurements for determining the magnetic ground state of these samples and its dependence on the respective substitution level.
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