Dresden 2017 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 16: Crystallography - Poster Session (KR with DF)

DF 16.6: Poster

Mittwoch, 22. März 2017, 18:00–20:00, P4

Synthesis and controlled growth of α-RuCl3 crystals on the nanoscale via chemical vapour transport (CVT) — •Martin Grönke, Mihai-Ionut Sturza, Barbara Eichler, Sandra Schiemenz, Victoria Eckert, Silke Hampel, and Bernd Büchner — IFW Dresden

Crystal growth of different transition metal halogenides representing a very up to date research topic in solid state chemistry surface physics. Among the interest for materials with strong anisotropic bonding-dependent interactions, resulting frustration effects could stabilize new patterns of cooperative magnetic interactions, or even a spin-liquid-state. One candidate to realize a Kitaev spin model is the layered honeycomb magnet α-Rutheniumchloride (α-RuCl3) with strongly frustrated, anisotropic interactions between spin-orbit entangled jeff = 1/2 Ru3+ magnetic moments.

Physical properties in nanoscale systems may differ from the respective bulk phase and could even lead to novel physical properties. Herein we present to our knowledge the first approach to synthesize phase pure α-RuCl3 crystals on the nanoscale via chemical vapour transport (CVT). To understand the growth mechanisms and to optimize the synthesis we performed thermodynamic modelling with the program Tragmin. We obtained very thin single crystals by CVT with heights around 40 nm. The crystal habit is characterized by means of SEM, TEM and AFM. Furthermore EDX, WDX, XRD, micro-RAMAN and SQUID-VSM measurements proving composition, phase-purity and predicted magnetic properties.