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

In two-dimensional (2D) spin systems, the augmentation of spin fluctuations gives rise to quasi-long-range order; however, how they manifest in spin transport remains unclear. Here we investigate the spin Seebeck effect (SSE) in a quasi-2D antiferromagnet, BaNi $_{2}$ V $_{2}$ O $_{8}$ , which has been reported to exhibit the Berezinskii-Kosterlitz-Thouless (BKT) transition owing to its distinct 2D nature. We found that the SSE in Pt / BaNi $_{2}$ V $_{2}$ O $_{8}$ persists well above the Néel temperature, significantly different from the behavior of 3D ordered magnets. Our numerical analysis for a 2D microscopic spin model supports the hypothesis that the observed SSE is linked to strong magnetic correlations in the BKT-like phase.

Signature of BKT-like spin transport in a quasi-2D antiferromagnet BaNi $_{2}$ V $_{2}$ O $_{8}$

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Signature of BKT-like spin transport in a quasi-2D antiferromagnet BaNi $_{2}$ V $_{2}$ O $_{8}$

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Signature of BKT-like spin transport in a quasi-2D antiferromagnet BaNi22​V22​O88​

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Signature of BKT-like spin transport in a quasi-2D antiferromagnet BaNi22​V22​O88​

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Signature of BKT-like spin transport in a quasi-2D antiferromagnet BaNi $_{2}$ V $_{2}$ O $_{8}$

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Signature of BKT-like spin transport in a quasi-2D antiferromagnet BaNi $_{2}$ V $_{2}$ O $_{8}$

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