Thermal Hall conductivity in the cuprate Mott insulators Nd(2)CuO(4) and Sr(2)CuO(2)Cl(2).
Thermal Hall conductivity in the cuprate Mott insulators Nd(2)CuO(4) and Sr(2)CuO(2)Cl(2).
复制标题
铜酸盐莫特绝缘体 Nd2CuO4 和 Sr2CuO2Cl2 的热霍尔传导率
DOI：
10.1038/s41467-020-18881-z
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发表时间：
2020-10-21
影响因子：
16.6
通讯作者：
Taillefer L
中科院分区：
文献类型：
--
作者：
Boulanger ME;Grissonnanche G;Badoux S;Allaire A;Lefrançois É;Legros A;Gourgout A;Dion M;Wang CH;Chen XH;Liang R;Hardy WN;Bonn DA;Taillefer L
最近的热载体负责意外大的热霍尔电导率的铜氧化物莫特绝缘体La 2CuO 4被证明是声子。然而，铜酸盐中声子在磁场中获得手性的机制仍然是未知的。在这里，我们报告了一个类似的热霍尔电导率在两个铜氧化物莫特绝缘体具有显着不同的晶体结构和磁序-Nd 2CuO 4和Sr 2CuO 2Cl 2-并表明，两个潜在的机制可以排除-散射的声子由稀土杂质和结构域。我们的比较研究进一步揭示了正交性，顶端氧，氧八面体的倾斜和CuO 2平面外的自旋的倾斜是不必要的手性机制。我们的研究结果指出了一种来自声学声子与CuO 2平面的本征激发耦合的手征机制。是什么使铜酸盐中的声子成为手性的，如通过它们的热霍尔效应测量的，是一个未解决的问题。在这里，作者排除了两个外在的机制，并认为手性来自耦合的声学声子的CuO 2平面的内在激发。
The heat carriers responsible for the unexpectedly large thermal Hall conductivity of the cuprate Mott insulator La2CuO4 were recently shown to be phonons. However, the mechanism by which phonons in cuprates acquire chirality in a magnetic field is still unknown. Here, we report a similar thermal Hall conductivity in two cuprate Mott insulators with significantly different crystal structures and magnetic orders – Nd2CuO4 and Sr2CuO2Cl2 – and show that two potential mechanisms can be excluded – the scattering of phonons by rare-earth impurities and by structural domains. Our comparative study further reveals that orthorhombicity, apical oxygens, the tilting of oxygen octahedra and the canting of spins out of the CuO2 planes are not essential to the mechanism of chirality. Our findings point to a chiral mechanism coming from a coupling of acoustic phonons to the intrinsic excitations of the CuO2 planes. What makes the phonons in cuprates become chiral, as measured by their thermal Hall effect, is an unresolved question. Here, the authors rule out two extrinsic mechanisms and argue that chirality comes from a coupling of acoustic phonons to the intrinsic excitations of the CuO2 planes.
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影响因子：
16.6
作者：
Doiron-Leyraud N;Cyr-Choinière O;Badoux S;Ataei A;Collignon C;Gourgout A;Dufour-Beauséjour S;Tafti FF;Laliberté F;Boulanger ME;Matusiak M;Graf D;Kim M;Zhou JS;Momono N;Kurosawa T;Takagi H;Taillefer L
通讯作者：
Taillefer L
影响因子：
64.8
作者：
Badoux, S.;Tabis, W.;Proust, Cyril
通讯作者：
Proust, Cyril
影响因子：
8.6
作者：
Li, SY;Taillefer, L;Chen, XH
通讯作者：
Chen, XH
影响因子：
1.3
作者：
Inyushkin, A. V.;TaIdenkov, A. N.
通讯作者：
TaIdenkov, A. N.
影响因子：
8.6
作者：
Chen, Jing-Yuan;Kivelson, Steven A.;Sun, Xiao-Qi
通讯作者：
Sun, Xiao-Qi