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In two-dimensional (2D) spin systems, the augmentation of spin fluctuationsgives rise to quasi-long-range order; however, how they manifest in spintransport remains unclear. Here we investigate the spin Seebeck effect (SSE) ina quasi-2D antiferromagnet, BaNi$_2$V$_2$O$_8$, which has been reported toexhibit the Berezinskii-Kosterlitz-Thouless (BKT) transition owing to itsdistinct 2D nature. We found that the SSE in Pt / BaNi$_2$V$_2$O$_8$ persistswell above the N\'eel temperature, significantly different from the behavior of3D ordered magnets. Our numerical analysis for a 2D microscopic spin modelsupports the hypothesis that the observed SSE is linked to strong magneticcorrelations in the BKT-like phase.

Signature of BKT-like spin transport in a quasi-2D antiferromagnet BaNi$_2$V$_2$O$_8$