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arXiv 2403.08581cond-mat.mes-hall
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自旋熵对二维磁体热电性质的影响

Impact of spin-entropy on the thermoelectric properties of a 2D magnet

Alessandra Canetta, Serhii Volosheniuk, Sayooj Satheesh, José Pedro Alvarinhas Batista, Aloïs Castellano, Riccardo Conte, Daniel G. Chica, Kenji Watanabe, Takas… 展开作者

Alessandra Canetta, Serhii Volosheniuk, Sayooj Satheesh, José Pedro Alvarinhas Batista, Aloïs Castellano, Riccardo Conte, Daniel G. Chica, Kenji Watanabe, Takashi Taniguchi, Xavier Roy, Herre S. J. van der Zant, Marko Burghard, Matthieu J. Verstraete, Pascal Gehring

AI总结:

本研究通过同步测量电导和热电流,发现自旋熵显著增强二维磁体CrSBr的热电功率因子,低温下磁场可使其提高600%,证实热电测量可灵敏探测低维磁体的磁相变。

摘要:

热电材料的热-电转换效率与每个电荷载流子的熵密切相关。因此,磁性材料有望成为高效能量收集器的构建单元,因为其载流子熵因自旋自由度而增强。在本工作中,我们研究了这种自旋熵如何影响A型反铁磁体CrSBr中的热-电转换。我们以温度和磁场为调控参数,在改变磁有序的同时,对电导和热电流进行了同步测量。我们发现,在奈尔温度附近,热电功率因子显著增强。我们进一步揭示,在低温下施加磁场可使功率因子提高多达600%。我们的结果表明,通过利用自旋熵的显著影响,可以优化二维磁体的热电性质,并证实热电测量是研究低维磁体中细微磁相变的一种灵敏工具。

英文摘要:

Heat-to-charge conversion efficiency of thermoelectric materials is closely linked to the entropy per charge carrier. Thus, magnetic materials are promising building blocks for highly efficient energy harvesters, as their carrier entropy is boosted by a spin degree of freedom. In this work, we investigate how this spin entropy impacts heat-to-charge conversion in A-type antiferromagnet CrSBr. We perform simultaneous measurements of electrical conductance and thermocurrent while changing magnetic order using temperature and magnetic field as tuning parameters. We find a strong enhancement of the thermoelectric power factor around the Néel temperature. We further reveal that the power factor at low temperature can be increased by up to 600% upon applying a magnetic field. Our results demonstrate that the thermoelectric properties of 2D magnets can be optimized by exploiting the sizeable impact of spin entropy and confirm thermoelectric measurements as a sensitive tool to investigate subtle magnetic phase transitions in low-dimensional magnets.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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