Signature of BKT-like spin transport in a quasi-2D antiferromagnet BaNiVO
arXiv:2312.15615 · doi:10.1103/PhysRevMaterials.9.L011401
Abstract
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, BaNiVO, 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 / BaNiVO 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.
arXiv commentMain text: 15 pages, 4 figures, Supplementary: 12 pages
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