In the classical square-lattice XXZ antiferromagnet, the longitudinal spin conductivity diverges exponentially at the XY-type Kosterlitz-Thouless transition, while thermal conductivity shows no anomaly.
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Effects of magnetic anisotropy on spin and thermal transports in classical antiferromagnets on the square lattice
In the classical square-lattice XXZ antiferromagnet, the longitudinal spin conductivity diverges exponentially at the XY-type Kosterlitz-Thouless transition, while thermal conductivity shows no anomaly.