Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 19: Poster Session: Correlated Electrons 1
TT 19.15: Poster
Montag, 20. März 2017, 15:00–19:00, P2-EG
Thermal expansion measurements on Cs2CuCl4−xBrx at sub-Kelvin temperatures — •Satya Krishna Thallapaka, Christian Thurn, Ulrich Tutsch, Bernd Wolf, and Michael Lang — Physikalisches Institut, SFB/TR49, Goethe Uni Frankfurt, DE
In recent years, Cs2CuCl4 and Cs2CuBr4 have been extensively investigated both experimentally and theoretically, as they represent model systems for quasi-2D triangular-lattice quantum antiferromagnets. They attracted much attention due to their unconventional magnetic properties resulting from the interplay of strong quantum fluctuations in reduced dimensions, geometrical frustration and effects of spin-lattice interactions close to the field-induced quantum critical point (QCP). Recently, a study of the mixed system Cs2CuCl4−xBrx has identified two novel compounds [1] with well-ordered halide sublattices due to a site-selective substitution mechansim, namely Cs2CuCl3Br1 and Cs2CuCl2Br2. It was predicted that the latter compound is showing an even higher degree of frustration than the border compounds. Thus, the series Cs2CuCl4−xBrx is ideal to study the effects of frustration and dimensionality around the QCP. To this end, we will present measurements of the thermal expansion coefficient on Cs2CuCl4 down to T = 40 mK around the field-induced QCP. The thermal expansion coefficient has been proven to be particularly suited to probe the anomalous thermodynamics of QCPs [2]. In addition, we will compare these results to measurements of the thermal expansion on the mixed system Cs2CuCl2Br2 and to specific heat measurements.
[1] Cong et al., PRB 83, 064425 (11)
[2] Zhu et al., PRL 91, 066404 (03)