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TT: Tiefe Temperaturen

TT 17: Symposium Quantum Magnetism in Molecule-based Materials

TT 17.3: Fachvortrag

Montag, 7. März 2005, 11:30–12:00, TU H104

Molecular solids - model systems for exploring quantum magnetism in reduced dimensions — •Michael Lang¹, Bernhard Brendel¹, Andreas Brühl¹, Jörg Magerkurth¹, Volodymyr Pashchenko¹, Bernd Wolf¹, Larisa Zherlitsina², Norbert Auner², Günter Margraf², Hans Lerner², and Matthias Wagner² — ¹Physikalisches Institut, J.W. Goethe-Universität Frankfurt, FOR 412, 60054 Frankfurt — ²Institut für Anorganische Chemie, J.W. Goethe-Universität, Frankfurt, FOR 412, 60439 Frankfurt

By combining open-shell transition metal ions with suitable organic linkers flexible building block systems may be produced for generating novel classes of materials, especially quantum magnets with distinct exchange-coupling topologies. A particularly interesting feature of these molecule-based magnets is their small exchange coupling constants J, weak enough for laboratory magnets to drive the systems into the interesting high-field regime where gµ_BB > J. In this contribution we will discuss various realizations of molecule-based low-dimensional quantum magnets such as Cu(II) cyclosiloxanolate complexes or a Cu(II) coordination polymer. The latter system can be used to study generic magnetocaloric and magnetoelastic properties of the antiferromagnetic S = 1/2 Heisenberg chain near the saturation field.