Abstract
We report on measurements of magnetic and thermodynamic properties on two different Cu2+-containing S = 1/2 dimer systems. One is the recently synthesized metal-organic system C36H48Cu2F6N8O12S2 (TK91). At temperatures T < 0.2K and fields around 6T, strong enough to close the spin gap to the excited triplet state, indications for a field-induced phase transition are observed making this system a potential candidate to study the Bose-Einstein condensation of magnons. The second system is the natural mineral Cu3(CO3)2(OH)2(azurite) which was identified as a distorted diamond chain–a realization of a 1D quantum frustrated system. We find a huge acoustic anomaly around 31T accompanying a magnetic soft mode.
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