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arXiv 2201.05457cond-mat.mtrl-sci
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反钙钛矿反铁磁体中的可控反常能斯特效应

Controllable anomalous Nernst effect in an antiperovskite antiferromagnet

Yunfeng You, Wenxuan Zhu, Hua Bai, Yongjian Zhou, Lei Han, Leilei Qiao, Tongjin Chen, Feng Pan, Cheng Song

摘要:

反常能斯特效应(Anomalous Nernst effect,ANE)是由纵向温度梯度产生横向电压的一种效应,由于其在热电转换中的潜力以及与能带结构的Berry曲率密切相关,近年来引起了人们的广泛关注。反铁磁体中的ANE(ANE in Antiferromagnets,AFM)避免了铁磁体的杂散场,具有实现高效、密集集成热电堆的优势。在这里,我们报告的ANE在反钙钛矿非共线原子力显微镜Mn3SnN实验观察,这是由位于费米能级附近的Weyl点的增强Berry曲率触发。考虑到反钙钛矿结构Mn 3SnN具有丰富的磁性相变,我们通过双轴应变来调制非共线AFM组态,从而使我们能够控制其ANE。我们的研究结果提供了一类潜在的材料,以探索非共线AFM的Weyl物理,以及实现反铁磁自旋热电子学,具有良好的前景,能量转换和信息处理。

英文摘要:

Anomalous Nernst effect (ANE), the generation of a transverse electric voltage by a longitudinal temperature gradient, has attracted increasing interests of researchers recently, due to its potential in the thermoelectric power conversion and close relevance to the Berry curvature of the band structure. Avoiding the stray field of ferromagnets, ANE in antiferromagnets (AFM) has the advantage of realizing highly efficient and densely integrated thermopiles. Here, we report the observation of ANE in an antiperovskite noncollinear AFM Mn3SnN experimentally, which is triggered by the enhanced Berry curvature from Weyl points located close to the Fermi level. Considering that antiperovskite Mn3SnN has rich magnetic phase transition, we modulate the noncollinear AFM configurations by the biaxial strain, which enables us to control its ANE. Our findings provide a potential class of materials to explore the Weyl physics of noncollinear AFM as well as realizing antiferromagnetic spin caloritronics that exhibits promising prospects for energy conversion and information processing.

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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