Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 17: Poster Session Correlated Electrons 1

TT 17.10: Poster

Montag, 16. März 2020, 15:00–19:00, P2/EG

Crystal growth and characterization of the frustrated spinsystems (Cs2−xRbx)CuCl4 — •Sarah Krebber, Christian Klein, and Cornelius Krellner — 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, 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 magnetic properties are caused by Jahn-Teller distorted (CuCl4) tetrahedra, which are arranged in layers separated by the alkali atoms. In these layers the localized Cu2+ spins form a triangular lattice, where the spins interact through exchange couplings. The resulting geometric frustration leads to quantum spin liquid properties at low temperatures. 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-known parent compound Cs2CuCl4. Furthermore we report an experimental study of the low-temperature specific heat and magnetic susceptibility of the substitution series Cs2CuCl4−xBrx (x = 0, 1, 2, 4) [2].

[1] H.T. Witteveen et al., Mater. Res. Bull. 9, 345 (1974)

[2] U.Tutsch et al., PRL 123, 147202 (2019)

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