Dresden 2017 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 19: Poster Session: Correlated Electrons 1

TT 19.30: Poster

Montag, 20. März 2017, 15:00–19:00, P2-EG

Crystal growth and magnetic characterization of kagome-type materials — •Christian Klein1, Ranjith Kumar2, Mahmoud Abdel-Hafiez1, Michael Baenitz2, and Cornelius Krellner11Physikalisches Institut, Goethe-University, D- 60438 Frankfurt am Main, Germany — 2Max-Planck-Institute for Chemical Physics of Solids, D-01187 Dresden, 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 the spin-1/2 antiferromagnet material Barlowite (Cu4(OH)6BrF), which represents a model system for two-dimensional kagome-layered structures[2]. 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[3].

Crystals were grown under hydrothermal conditions. 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 ordering effects at low temperature.

[1] P. A. Lee, Science 321, 1306 (2008).

[2] T.-H. Han et al., Phys. Rev. Lett. 113, 227203 (2014).

[3] S. Chu et al., Appl. Phys. Lett. 98, 092508 (2011).

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