The Unusual Magnetic Properties of some Ribbon-Chain Quantum Antiferromagnets

I will report on the magnetic properties of some new low-dimensional quantum antiferromagnets which share ribbon chains as a common structural feature. Systems with competing intra-chain spin-exchange interactions have attracted particular attention since they may exhibit unusual magnetic groundstates. Of special interest are systems that develop incommensurate magnetic ordering which can induce e.g. multiferroicity