6533b7d7fe1ef96bd1268ca7

RESEARCH PRODUCT

Magnetism in lowdimensional systems

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Abstract Magnetism in lowdimensional systems is characterized by the importance of space and time dependent correlations with respect to static long range order which does not exist for finite temperatures in such systems except for the 2D-Ising model. Typical properties of these strongly fluctuating systems will be discussed and compared to the behaviour of normal magnets. Strongly nonlinear effects can be observed, like solitons and new quantum groundstates as in the 1D-Heisenberg antiferromagnet for S=1. As real crystals with quasi-lowdimensional magnetic behaviour can be obtained, experiments in this field have significantly advanced our understanding of collective processes in systems with strong correlations varying in space and time. All such crystals are threedimensional, thus the influence of threedimensional effects must be considered for a correct interpretation of experimental results. Due to the simple topology of the interactions in one dimension systematic studies of the energies involved, e.g. exchange and anisotrophy, are possible.