B4: Single crystal growth of tunable coupled-dimer systems and triangular antiferromagnets
Prof. Dr. Wolf Aßmus
Dr. Franz Ritter
The project aims at the preparation of high-quality single crystals for the systematic experimental investigation of the condensation of magnetic excitations in quantum magnets. The systems selected for this approach are alkali-copper-silicates and earth-alkali halogen cuprates including the recently intensively discussed BEC systems Cs2CuCl4 and BaCuSi2O6. For both systems we intend, via chemical substitution, to modify the effective spin interactions: In the case of the frustrated S = 1/2 system Cs2CuCl4, the degree of frustration will be enhanced by replacing the halogen constituent chlorine gradually by bromine, whereas for the dimer system BaCuSi2O6, the dimer-dimer interactions will be modified via replacing the earth-alkali component according to (Ba, Sr, Ca)CuSi2O6.
The materials developed and synthesised in this project will be fully characterised concerning their electronic structure and collective magnetic properties in the projects (Aeschlimann/Felser/Schönhense (B8)) and (Wolf/Lang (B1)), respectively. The experimentally determined material properties will be compared with ab initio calculations to be carried out in the project (Jeschke/Valentí (B2)).
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