论文标题
合作RU（4D）-HO（4F）磁性顺序和6H-玻璃体多效性BA3HORU2O9中的磁性顺序和相共存
Cooperative Ru(4d)-Ho(4f) magnetic orderings and phase coexistence in the 6H-perovskite multiferroic Ba3HoRu2O9
论文作者
论文摘要
我们通过全面的中子粉末衍射测量值报告了6H-陶瓷多效系统BA3HORU2O9中的合作磁有序。该系统在TN1〜50 K处进行远距离抗铁磁体排序，而传播波矢量为K1 =（0.5 0 0），其过渡温度比以前报道的一个〜10 K（TN2）的过渡温度高得多。 Ru和Ho-Moments在TN1以下同时订购，然后在较低的温度下进行自旋矫正取向，显示出强RU（4D）-HO（4F）磁相关。在TN1以下另一个具有传播波矢量k2 =（0.25 0.25 0）的磁相，并与与K1相关的磁相结合，很少观察到它，并暗示了由于磁接地状态下的相位竞争而引起的复杂磁性。我们认为，由TN2以下的K2-Wave载体相关的上下降低的自旋结构引起的交换 - 可能是导致以前在该化合物中报道的小铁电偏振。
We report cooperative magnetic orderings in a 6H-perovskite multiferroic system, Ba3HoRu2O9, via comprehensive neutron powder diffraction measurements. This system undergoes long-range antiferromagnetic ordering at TN1 ~ 50 K with a propagation wave vector of K1 = (0.5 0 0), a transition temperature much higher than the previously reported one at ~10 K (TN2). Both Ru and Ho-moments order simultaneously below TN1, followed by spin-reorientations at lower temperatures, demonstrating strong Ru(4d)-Ho(4f) magnetic correlation. Below TN1 another magnetic phase with a propagation wave vector K2 = (0.25 0.25 0) emerges and coexists with the one associated with K1, which is rarely observed and suggests complex magnetism due to phase competition in the magnetic ground state. We argue that the exchange-striction arising from the up-up-down-down spin structure associated with K2-wave vector below TN2 may be responsible for the small ferroelectric polarization reported previously in this compound.
