<br>交变磁性 RuO2 中的晶体热传输,Physical Review Letters

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交变磁性 RuO2 中的晶体热传输
Physical Review Letters ( IF 8.1 ) Pub Date : 2024-01-29 , DOI: 10.1103/physrevlett.132.056701
Xiaodong Zhou _{1,

2,

3} , Wanxiang Feng _{1,

2} , Run-Wu Zhang _{1,

2} , Libor Šmejkal _{4,

5} , Jairo Sinova _{4,

5} , Yuriy Mokrousov _{4,

6} , Yugui Yao _{1,

2}

Affiliation

我们证明了最近发现的一类磁性材料（交替磁体）中出现了明显的热传输。根据为展示交流磁体执行的对称性论证和第一性原理计算，

{RuO}_{2}

，我们发现这种材料中的晶体能斯特效应和晶体热霍尔效应非常大，并且相对于尼尔矢量具有很强的各向异性。我们发现大晶体热传输源自动量空间中贝里曲率的三个来源：由于分离良好的能带之间的交叉而产生的外尔费米子、强自旋翻转赝节点表面和弱自旋翻转阶梯跃迁，定义为穿过费米表面的类似色散的非常弱的自旋分裂态之间的跃迁。此外，我们揭示了异常的热和电传输系数

{RuO}_{2}

它们通过扩展的维德曼-弗朗茨定律联系在一起，其温度范围比传统磁体的预期要宽得多。我们的结果表明，互变磁体可能在实现自旋热电子学概念方面发挥主导作用，这是铁磁体或反铁磁体无法实现的。

"点击查看英文标题和摘要"

Crystal Thermal Transport in AltermagneticRuO2

We demonstrate the emergence of a pronounced thermal transport in the recently discovered class of magnetic materials—altermagnets. From symmetry arguments and first-principles calculations performed for the showcase altermagnet,

{RuO}_{2}

, we uncover that crystal Nernst and crystal thermal Hall effects in this material are very large and strongly anisotropic with respect to the Néel vector. We find the large crystal thermal transport to originate from three sources of Berry’s curvature in momentum space: the Weyl fermions due to crossings between well-separated bands, the strong spin-flip pseudonodal surfaces, and the weak spin-flip ladder transitions, defined by transitions among very weakly spin-split states of similar dispersion crossing the Fermi surface. Moreover, we reveal that the anomalous thermal and electrical transport coefficients in

{RuO}_{2}

are linked by an extended Wiedemann-Franz law in a temperature range much wider than expected for conventional magnets. Our results suggest that altermagnets may assume a leading role in realizing concepts in spin caloritronics not achievable with ferromagnets or antiferromagnets.

更新日期：2024-01-30

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