论文标题
Cuprate Mott绝缘子中的热厅电导率ND $ _2 $ CUO $ _4 $和SR $ _2 $ CUO $ _2 $ cl $ cl $ _2 $
Thermal Hall conductivity in the cuprate Mott insulators Nd$_2$CuO$_4$ and Sr$_2$CuO$_2$Cl$_2$
论文作者
论文摘要
最近证明了铜莫特绝缘子LA $ _2 $ cuo $ _4 $的高出大厅电导率的热载体最近被证明是声子。但是，丘比特中的声子在磁场上获取手性的机制仍然未知。在这里，我们报告了具有明显不同的晶体结构和磁性订单明显不同的两个丘脑莫特绝缘子的类似的热厅电导率-ND $ _2 $ _2 $ cuo $ _4 $和sr $ _2 $ cuo $ _2 $ _2 $ cl $ _2 $ - 并表明两个潜在的机制可以被排除在罕见的散布 - 稀有的构造和结构上的构成症状。我们的比较研究进一步表明，正晶，根尖氧，氧气的倾斜和从Cuo $ _2 $平面中旋转的旋转对于手性机制并不是必不可少的。我们的发现指出，来自声音声子的耦合到Cuo $ _2 $飞机的固有激发的手性机制。
The heat carriers responsible for the unexpectedly large thermal Hall conductivity of the cuprate Mott insulator La$_2$CuO$_4$ 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 - Nd$_2$CuO$_4$ and Sr$_2$CuO$_2$Cl$_2$ - 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 CuO$_2$ 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 CuO$_2$ planes.
