标题： 新的双钙钛矿 Lu$_2$MnCoO$_6$中的多铁性行为 显示英文标题

标题： Multiferroic behavior in the new double-perovskite Lu$_2$MnCoO$_6$

摘要： 我们介绍了一种新的多铁氧化物成员，Lu$_2$MnCoO$_6$，我们使用X射线衍射、中子衍射、比热、磁化率、电极化和介电常数测量对其进行了研究。 这种材料在35 K以下具有与净磁化强度强耦合的电极化，尽管在c方向上$S = 3/2$ Mn$^{4+}$ 和Co$^{2+}$ 自旋以$\uparrow \uparrow \downarrow \downarrow$ 的构型发生反铁磁有序。 我们讨论磁序是通过$\uparrow \uparrow$和$\downarrow \downarrow$铁磁畴之间的畴壁凝聚来描述的，每个畴壁由于空间反演对称性破缺而产生净电极化。在施加的磁场中，畴壁滑动，控制净磁化、电极化和磁电耦合的大小。 显示英文摘要

摘要： We present a new member of the multiferroic oxides, Lu$_2$MnCoO$_6$, which we have investigated using X-ray diffraction, neutron diffraction, specific heat, magnetization, electric polarization, and dielectric constant measurements. This material possesses an electric polarization strongly coupled to a net magnetization below 35 K, despite the antiferromagnetic ordering of the $S = 3/2$ Mn$^{4+}$ and Co$^{2+}$ spins in an $\uparrow \uparrow \downarrow \downarrow$ configuration along the c-direction. We discuss the magnetic order in terms of a condensation of domain boundaries between $\uparrow \uparrow$ and $\downarrow \downarrow$ ferromagnetic domains, with each domain boundary producing a net electric polarization due to spatial inversion symmetry breaking. In an applied magnetic field the domain boundaries slide, controlling the size of the net magnetization, electric polarization, and magnetoelectric coupling.