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    Chapter and Conference Paper

    Critical fluctuations in the 2D XY antiferromagnet BaNi2(PO4)2 : NMR measurements

    Non-linear excitations are known to play a crucial role in low-dimensional magnetism. For the two-dimensional (2D) XY model these non-linear excitations are described in terms of vortices which govern the so-c...

    Ph. Gaveau, J. P. Boucher, L. P. Regnault, Y. Henry in Nonlinear Coherent Structures (1990)