Magnetic ordering phenomena in some low-dimensional xy-like magnetic model systems by Dirk Visser

“…The physics of the one-dimensional (I-D) Ising, XY and Heisenberg systems as well as the two-dimensional (2-D) Heisenberg and XY systems differ from the 2-D Ising and three-dimensional (3-D) Heisenberg magnets in that they do not show magnetic order in the presence of magnetic short-range correlations for T --70 K. …”
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