Potential signature of a Kosterlitz-Thouless transition in BaNi2V2O8 |
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Authors: | Heinrich M Krug von Nidda H-A Loidl A Rogado N Cava R J |
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Institution: | Experimentalphysik V, Elektronische Korrelationen und Magnetismus, Institut für Physik, Universit?t Augsburg, D-86135 Augsburg, Germany. |
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Abstract: | ESR measurements are reported for the quasi-two-dimensional honeycomb antiferromagnet BaNi2V2O8. Planar anisotropic properties are confirmed by angular dependent investigations of resonance field and linewidth. The divergence of the temperature-dependent linewidth on approaching T(N) from above is described in terms of the Kosterlitz-Thouless transition, the critical behavior close to long-range magnetic order, and the 2D Heisenberg antiferromagnet. We provide arguments that the Kosterlitz-Thouless scenario is compatible with the observed critical exponent and suggest BaNi2V2O8 is a weakly anisotropic 2D Heisenberg antiferromagnet. |
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