阻挫尖晶石型铜酸盐GeCu $_2$ O $_4$的多铁性
Multiferroicity in the frustrated spinel cuprate GeCu$_2$O$_4$
摘要：
与其他磁阻挫尖晶石系统不同，GeCu $_{2}$ O $_{4}$是一种强四方畸变的尖晶石铜酸盐，其中CuO $_{2}$条带沿垂直于$c$轴的交替方向延伸。在这里，GeCu $_{2}$ O $_{4}$样品的高品质的制备通过高压合成（在4 GPa）和相应的磁性和介电性能进行了研究。我们首次观察到在T $_{N}$ $\sim$ 33~K出现铁电极化。虽然GeCu $_{2}$ O $_{4}$（$P$ $\sim$ 0.2 $μ$ C/m $^{2}$）的铁电极化很弱，但自旋诱导多铁性的存在对GeCu $_{2}$ O $_{4}$可能的基态磁结构和/或相应的多铁性理论模型提供了强有力的约束.
英文摘要：
Different from other magnetically frustrated spinel systems, GeCu$_{2}$O$_{4}$ is a strongly tetragonal distorted spinel cuprate in which edge-sharing CuO$_{2}$ ribbons are running along alternating directions perpendicular to the $c$-axis. Here, GeCu$_{2}$O$_{4}$ samples of high quality were prepared via high pressure synthesis (at 4 GPa) and the corresponding magnetic and dielectric properties were investigated. For the first time, we observed a ferroelectric polarization emerging at T$_{N}$ $\sim$ 33~K. Although the ferroelectric polarization is weak in GeCu$_{2}$O$_{4}$ ($P$ $\sim$ 0.2$μ$C/m$^{2}$), the existence of spin-induced multiferroicity provides a strong constraint on the possible ground state magnetic structures and/or the corresponding theoretical models of multiferroicity for GeCu$_{2}$O$_{4}$.
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