Berlin 2008 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 32: Correlated Electrons: Poster Session
TT 32.26: Poster
Thursday, February 28, 2008, 14:00–18:00, Poster B
Search for coupled S=1/2 dimer systems in a new class of nitronyl nitroxides biradicals — •K. Remović-Langer11, U. Tutsch1, C. T. Pham1, M. Baumgarten2, E. A. Mostovich2, B. Wolf1, and M. Lang1 — 1Physikalisches Institut, J.W. Goethe-Universität, Max-von-Laue-Str. 1, SFB/TR 49, D-60438 Frankfurt(M), Germany — 2Max-Planck-Institut für Polymerforschung, Ackermannweg 10, SFB/TR 49, D-55128 Mainz, Germany
Recently, quantum magnets such as coupled-dimer systems and easy-plane antiferromagnets have emerged as interesting objects for studying the properties of magnetic field-induced Bose-Einstein condensation (BEC). Up until the present day, most of the studies have been focused on the magnetic field-induced BEC. Some recent experiments, however, give evidence for a transition which could be interpreted as pressure-induced BEC. So far, TlCuCl3, is the only quantum magnet on which field- and pressure-induced transitions have been studied. Biradical-based coupled-dimer systems, yielding moderate intradimer and tunable dimer-dimer interactions, are promising target materials for studying the properties of those field- and pressure-induced quantum phase transitions. We report here on the results of magnetic measurement on a group of metal-organic nitronyl nitroxides dimer systems which are proving to be a promising class of material for realization of systems to study field- and pressure-induced quantum phase transitions and their critical phenomena.