论文标题
在反植物反铁磁铁中可控异常的Nernst效应
Controllable anomalous Nernst effect in an antiperovskite antiferromagnet
论文作者
论文摘要
纵向温度梯度的横向电压产生的异常Nernst效应（ANE）最近引起了研究人员的兴趣，由于其在热电功率转化中的潜力以及与带结构的浆果曲率紧密相关的潜力。避免了抗铁磁体（AFM）的ANE的杂散场，其优势是实现高效且密集整合的热层。在这里，我们在Antiperovskite非共线性AFM MN3SNN中报告了ANE的观察，这是由位于费米水平附近的Weyl点增强的浆果曲率触发的。考虑到Antiperovskite MN3SNN具有丰富的磁相变，我们通过双轴菌株调节非共线AFM构型，这使我们能够控制其ANE。我们的发现提供了一类潜在的材料，以探索非共线性AFM的Weyl物理学，并实现抗磁性旋转热量量热膦型，这些量子能在能量转换和信息处理方面具有令人鼓舞的前景。
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.
