Regensburg 2019 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 50: Poster Session: Correlated Electrons 2
TT 50.11: Poster
Mittwoch, 3. April 2019, 15:00–18:30, Poster D
Crystal growth and characterization of the frustrated spin systems Cs2−xRbxCuCl4 — •Sarah Krebber, Christian Klein, and Cornelius Krellner — Physikalisches Institut, Goethe-Universität Frankfurt am Main, Max-von-Laue-Straße 1, D-60438 Frankfurt am Main-
Crystals of the antiferromagnetic insulator Cs2CuCl4 and the substitution series (Cs2−xRbx)CuCl4 (x = 0.1, 0.2) were grown by vertical Bridgman method. The controlled substitution of cesium atoms with the smaller rubidium, causes chemical pressure on the crystal lattice [1]. The essential magnetic units in these systems are Jahn-Teller distorted (CuCl4) tetrahedra, which are arranged in layers separated by the alkali atoms. These layers form a triangular lattice of localized Cu2+ spins, where the spins interact through exchange couplings. The resulting geometric frustration leads to quantum spin-liquid properties at low temperatures [2].
In addition to the growth and characterization of (Cs2−xRbx)CuCl4, we discuss the structural changes in the lattice parameters and the magnetic behavior of the substituted system in comparison to the well understood parent compound Cs2CuCl4.
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